一道真题，为什么？ 答案怪异？

这道题KEY是 B， 但C 为什么对呢？ 是不是答案错了？

11. The reasons for yesterday’s sharp rise in the stock market were much the same as that behind last week’s rally: a surge in the economy to a 5.6 percent annual growth rate and improved corporate earnings balanced by the lack of signs of inflationary pressure.

A)       that

B)       those

C)       what was

D)       for that

E)       they were