The geopolitical theory that stressed the strategic advantages of land over sea power is known as the:

A) domino theory.

B) rimland theory.

C) lebensraum theory.

D) heartland theory.

The correct answer is the heartland theory - answer D), which said that the land away from the seas was safer because it could be better defended.

A somewhat opposite theory was the rimland theory - this one was stressing the advantage of lying on the sea.

The other two options refer rather to speficic concepts from modern politics.