题目:
Let a, b, and c be three integers, and let a be a perfect square. If a/b = b/c, then which one of the following statements must be true?
选项:
A、Ac must be an even number
B、Bc must be an odd number
C、Cc must be a perfect square
D、Dc must not be a perfect square
E、Ec must be a prime number
答案:
C