According to the Realist Perspective, Why Was Germany More Threatening

According to the realist perspective, why was Germany more threatening to Great Britain than the United States when both Germany and the United States were gaining wealth and expanding their navies?

A) Great Britain shared a common culture with the United States but not with Germany.
B) Great Britain had close diplomatic ties with the United States but not with Germany.
C) Germany, compared to the United States, was geographically closer to Great Britain.
D) Germany had aggressive intentions toward Great Britain while the United States did not.