Magento 2 remove attribute options/values

Gideon\Returns\Setup\UpgradeData.php

<?php
 
namespace Gideon\Returns\Setup;
 
use Magento\Eav\Setup\EavSetupFactory;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
use Magento\Framework\Setup\UpgradeDataInterface;
use \Magento\Framework\App\ObjectManager;
 
class UpgradeData implements UpgradeDataInterface
{
    private $eavSetupFactory;
 
    private $objectManager;

    public function __construct(EavSetupFactory $eavSetupFactory,
                                ObjectManager $objectManager)
    {
        $this->eavSetupFactory = $eavSetupFactory;
        $this->objectManager = $objectManager;
    }
 
    public function upgrade(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
    {
        $setup->startSetup();
 
        if ($context->getVersion() && version_compare($context->getVersion(), '1.0.1') < 0) {
 
            $eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);
 
            $eavSetup->addAttribute(
                \Magento\Catalog\Model\Category::ENTITY,
                'is_cat_returnable',
                [
                    'type' => 'int',
                    'label' => 'Enable RMA',
                    'input' => 'select',
                    'required' => false,
                    'sort_order' => 10,
                    'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_STORE,
                    'source' => \Magento\Eav\Model\Entity\Attribute\Source\Boolean::class,
                    'group' => 'General Information',
                ],
                'cat_returnable_days',
                [
                    'type' => 'int',
                    'label' => 'Returnable in Days',
                    'input' => 'text',
                    'required' => false,
                    'sort_order' => 20,
                    'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_STORE,
                    'group' => 'General Information',
                ]
            );

            $eavSetup->addAttribute(
                \Magento\Catalog\Model\Product::ENTITY,
                'returnable_days',
                [
                    'group' => 'general',
                    'type' => 'text',
                    'backend' => '',
                    'frontend' => '',
                    'label' => 'Returnable in Days',
                    'input' => 'text',
                    'class' => '',
                    'source' => '',
                    'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_GLOBAL,
                    'visible' => true,
                    'required' => false,
                    'user_defined' => false,
                    'default' => false,
                    'searchable' => false,
                    'filterable' => false,
                    'comparable' => false,
                    'visible_on_front' => false,
                    'used_in_product_listing' => true,
                    'unique' => false,
                    'apply_to' => '',
                    'note' => 'Enter the maximum days a product can have return. For example, 10'
                ]
            );
        }

        if ($context->getVersion() && version_compare($context->getVersion(), '1.0.2') < 0) {
            $eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);
            $eavSetup->addAttribute(
                \Magento\Catalog\Model\Category::ENTITY,
                'cat_returnable_days',
                [
                    'type' => 'int',
                    'label' => 'Returnable in Days',
                    'input' => 'text',
                    'required' => false,
                    'sort_order' => 20,
                    'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_STORE,
                    'group' => 'General Information',
                ]
            );
        }
        // remove reason for return attribute options
        if ($context->getVersion() && version_compare($context->getVersion(), '1.0.3') < 0) {
            $objectManager = $this->objectManager::getInstance();
            $eavAttribute = $objectManager->create('Magento\Eav\Model\Config');

            /** @var \Magento\Eav\Model\Config $attribute */
            $attribute = $eavAttribute->getAttribute('rma_item', 'reason');
            //$attributeId = $eavAttribute->getAttributeId('rma_item', 'reason'); // to get attribute ID
         
         /* to add new options
         $options = [
                     'values' => [
                     'sort_order1' => 'title1',
                     'sort_order2' => 'title2',
                     'sort_order3' => 'title3',
                 ],
                 'attribute_id' => 'some_id',
             ];
            */
            $options = $attribute->getSource()->getAllOptions();

            foreach ($options as $optionId => $value) {            
                $options['value'][$optionId] = true;
                $options['delete'][$optionId] = true;
            }

            $setupObject = $objectManager->create('Magento\Eav\Setup\EavSetup');
            $setupObject->addAttributeOption($options);
        }        
        $setup->endSetup();
    }
}