(A) Events intervened, and in the late 1930s and 1940s, Germany suffered from "Over branding”.
(B) The British used to be fascinated by the home of Romanticism.
(C) But reunification and the federal government's move to Berlin have prompted Germany to think again about its image.
(D) The first foreign package holiday was a tour of Germany organized by Thomas Cook in 1855.
(E) Since then, Germany has been understandably nervous about promoting itself abroad.
BDAEC
We can easily see that there is a link between A and E. A mentions the problem of over branding in the 1930s and 1940s. E follows it up by saying that Germany has been nervous since then to promote itself. This rules out options (a) and (b). B is the introductory sentence as it talks about the home of Romanticism which is Germany that is talked about in all the other sentences. This determines option (c) as the answer. D follows logically from B by talking about the tour to Germany when the British were fascinated about the place.