Which answer choice shows the correct capitalization for the proper adjective in the following sentence?

The massive peaks of the Alps are a central part of the european continent.

A)The massive peaks of the alps are a central part of the european continent.

B)The massive peaks of the Alps are a central part of the European continent.

C)The massive peaks of the Alps are a Central part of the European Continent.

D)The massive peaks of the Alps are a central part of the European Continent.