if to answer this:
Which object has the greatest flexibility? A wooden block B paper cup C metal nail D glass bottle
i would go that a paper cup, because you can bend it, squeeze it, and do what ever you want, it will listen to you.
But if you try to do something with a glass bottle, or metal nail, it will just be broken, or crack, or for the metal nail, bend.
And for the wooden block, yes, you can dump on it, brake it, but it will not even fold. And the last for the paper cup, as i said, that is the only one that can actually move, and listen to what you want its moves to be like.
So the answer would be Paper Cup.
Hope that this would help you! =)