How Did the Arrival of the Huns Affect the Germanic

How did the arrival of the Huns affect the Germanic peoples?

A) The Germanic peoples were fractured into numerous small clans, which left them vulnerable to Roman forces.
B) The Germanic peoples were compelled to form large, more unified units that would be able to attack the Roman Empire more easily.
C) The Germanic peoples adopted the Huns' use of horse and mobile military tactics to enhance their ability to destroy the Roman Empire
D) The Germanic peoples were largely destroyed as an organized society and were soon taken over by other nomadic peoples.