A、  B、  C、  B正确答案是(B)。(C)是通过重复使用题干中的people设置的陷阱。(A)中的lower是“减少，放下，降低(声音或音调)”的意思，(C)中的that是“那个程度(这个程度)”的意思。

What did you put in this soup?
(A)Just meat and vegetables.
(B)It’s good, but a little cold.
(C)I think I’d rather have the salad.

I heard we hired some new people.
(A)You should lower it a little.
(B)Yes, to work for the sales team.
(C)There weren’t that many people there.