Task: Question Answering
Input (English): 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  
 (A) much more than that of the flat paper. (B) slightly more than that of the flat paper. (C) the same as that of the flat paper. (D) slightly less than that of the flat paper.
Output (English): C