Question

The excerpt below is from a speech about starting a debate club at a high school. Which of the choices best describes the figurative meaning of the phrase “sharpen their brains”?

Scientific studies have shown that the brain is like a muscle. As with any muscle, exercise is good for the brain. Starting a debate team at our school would give interested students a place to exercise and sharpen their brains. As a bonus, they would get to have fun, make new friends, and learn life skills.

A. to give a hard edge
B. to make dull
C. to improve memory
D. to make stronger

Answer 1

What do you think?

Answer 2

I don't know.

Answer 3

Take a guess.

Answer 4

C.