Malcolm is so good at math that he can do most calculations in his head. It's very rare that he has to use a pencil and paper to answer a math problem. What should Malcolm remember to do when taking math tests?
A. have his calculator at hand just in case he needs it
B. explain in short-answer format how he knew the right answer
C. show his work so he doesn't get points taken off
D. preview the test when he first receives it