Where in europe are the germanic languages mainly spoken?

The answer is:  Central, North, and Northwestern Europe.

All of these regions were ex-terrorizes of the German empire (which in the pas considered to be one of the strongest empire in Europe).

After the empire fell, its region were separated and form their own countries. But the language and cultures that are used in the remnants  still remain even until today.

(d) rivers.

explanation:

civilizations developed around rivers because their waters provided places to hunt and fish. also, as the rivers flooded, the lands around them became fertile. this allowed them to support farming. this is especially true of the nile river, which flooded the same time each year.