Here's a problem to solve: 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?

Among the 4 following options, which is the correct answer?

- A: color
 
- B: size
 
- C: smoothness
 
- D: thickness
 