Test.js

//let stepOptions = options.slice(0, options.length);

let stepOptions = options.map(({title}, i) => { title, index: [i] });
stepOptions.splice(1, 0, { title: 'Best of Both', index: [0, 1] });

{stepOptions.map((({title, index}), i) => <CheckBox label={title} key={i} value={this.isSelected(index)} onChange={() => onChange(index)} />)}

isSelected(index) {
  const { value } = this.props;
  
  return value === index;
}

value = [1], [0,1], [0]