英文题求解答我又来了.（）at the news that I didn't know what to say to c

英文题求解答
我又来了.
（）at the news that I didn't know what to say to comfort her.
A.So sad she looked
B.So sad did she look
C.So sadly she looked
D.So sadly did she look
倒装我就知道,问题是B和D该选哪一个啊?
原句是：She looked at the news sadly
还是:She looked sad at the news
我的老师说：at在这里指原因,所以选B,可是我觉得怪怪的
有没有人可以给一个比较明确的解释?
还是那句老话：不知道的人不要乱说