color size smoothness thickness
I gave my students this multiple choice question: Skyler is selecting the kind of paper he wants to use to make a greeting card. He wants to select paper that does not tear easily. Which of the following features of the paper is most important for Skyler to consider?

Only one answer is correct among these 4 choices:
- color
- size
- smoothness
- thickness

Could you tell me which one is correct?

thickness