much more than that of the flat paper. slightly more than that of the flat paper. the same as that of the flat paper. slightly less than that of the flat paper.
I gave my students this multiple choice question: A flat piece of paper has a mass of 5 grams. When the paper is crumpled into a ball, the mass of the crumpled paper is

Only one answer is correct among these 4 choices:
- much more than that of the flat paper.
- slightly more than that of the flat paper.
- the same as that of the flat paper.
- slightly less than that of the flat paper.

Could you tell me which one is correct?

the same as that of the flat paper.