have problem doing还是have problems doing?

题目

have problem doing还是have problems doing?
Did you have（）with the people when you were in the USA?
A.problem to talk B.problems talking C.problems to talk D.problem talking
这道题选B还是D?我选的是D因为课本上的课文里有have problem doing 的原句,但是老师给的答案是B
求详解

答案