select.cmp

<aura:application extends="force:slds">
	
    <aura:attribute type="String" name="v.whyCustCallSelected"></aura:attribute>
    
    <lightning:select label="Why Customer Called" aura:id="Why_Customer_Called__c" value="{!v.whyCustCallSelected}" >
                             
                                    <option value="--None--">--None--</option>

                               
                                <aura:iteration items="[1,2,3,4]" var="item">
                                    <option value="{!item}">{!item}</option>
                                </aura:iteration>
						</lightning:select>
</aura:application>