The options are defined by the question. The person only needs to recognize which is their preferred option. For some people, forced choices may cause them great anxiety. They may not know which choice they want, or they may want both choices and be unable to resolve their own conflict. Some people will refuse any idea that was not their own idea.
Person is offered the choice to come up with their own option.
For some people this is the perfect way to offer a choice. It gives them a sense of being in control, being responsible and being expected to think and decide for themselves. For some people this causes great anxiety. They may have no idea what they want to do. They may have no idea what you mean.