已知某经济某一年的国民收入是1000亿美元，净投资为零；第二年国民收入增至1200亿美元。在资本产量比率等于2的条件下，第二年的净投资（）。

A.增加了200亿美元

B.增加了400亿美元

C.仍然为0

D.增加了100亿美元

Man: Congratulations, Liming. You are the talk of the tongue and the pride of our class now.
Woman: If you are referring to my winning the English Speech contest, I don’t think it’s such a big deal. You know, I’ve spent two summer vacations learning English in Canada.
Question: What do we learn bout Liming from the conversation（）。

A. She doesn’t want to talk about the contest.

B. She’s modest about her success in the contest.

C. She’s spent two years studying English in Canada.

D. She is very proud of her success in the speech contest.