Select the correct answer.
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
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