Poll / Question

I need some help… I’m stuck !

This is for a product page. Before the user can click on the ‘buy now’ button I’d like them to select an answer to a simple radio box multiple choice question. The question will only have three answers and when the user selects the correct radio button the buy now button becomes active.

I’m a designer and only just learning this platform so any help would be greatly appreciated !

Thanks in Advance !!