What is lebensraum?

A. The plan to exterminate the Jews

B. The plan to take over Poland

C. A German term meaning "living space"

D. The German empire e. The Nazi administration

C.

A German term meaning "living space"

Explanation:

The term Lebensraum was coined by the German geographer, Friedrich Ratzel (1844-1904). During the last two decades of the 19th century, Ratzel developed a theory according to which the development of all species, including humans, is primarily determined by their adaptation to geographic circumstances.

Above all, Ratzel considered species migration as the crucial factor in social adaptation and cultural change. He went on to argue that, in order to remain healthy, species must continually expand the amount of space they occupy, for migration is a natural feature of all species, an expression of their need for living space.

I think it's D for what is lebensraum