I believe it is D since he’s telling why he spent a lot of time in Washington.
The answer would be D because A, B, and C are not relevant to her side of the argument. Those three letters really refer to the opposing side rather than her's. D is the only answer that seems logical for her to pick because it could be information that could be used on her side of the argument.
D and E would both reduce listener interest.
In America Britan and Germany and generally effected most of Europe due to America's economy failing.
Germany was in debt and unemployment was on the rise , Britan was effected by the war and like many other European countries they started to rely on the US for financial help as they where a major creditor for post war Europe.
so basically most of Europe and the US