Why Was the Rising Power of the United States Beginning

Why was the rising power of the United States beginning in the nineteenth century peacefully accommodated by the international system?

A) The United States and the other major powers at the time faced a common threat in Germany.
B) Other major powers had nuclear weapons and could rely on deterrence to protect them from the United States.
C) The United States became the predominant power too quickly for other states to react.
D) The United States and Great Britain had no conflict with each other.