请教一条逻辑题，谢谢！

答案是E,可以想通。请问B为什么不对啊？谢谢！

People with serious financial problems are so worried about money that they cannot be happy. Their misery makes everyone close to them—family, friends, colleagues—unhappy as well. Only if their financial problems are solved can they and those around them be happy.

Which one of the following statements can be properly inferred from the passage?

(A) Only serious problems make people unhappy.

(B) People who solve their serious financial problems will be happy.

(C) People who do not have serious financial problems will be happy.

(D) If people are unhappy, they have serious financial problems.

(E) If people are happy, they do not have serious financial problems.（E）

B其实是对原文的重述,而不是infer from

LZ理解错了题目才导致了错误.

E是正确的,实际上一个逆否命题:

原命题是:没钱  ---- 不开心

逆否命题:开心---有钱