What was the cause of the fall of the roman empire

The Barbarian attacks on Rome partially stemmed from a mass migration caused by the Huns' invasion of Europe in the late fourth century. When these Eurasian warriors rampaged through northern Europe, they drove many Germanic tribes to the borders of the Roman Empire.

Outside attacks from Germanic barbarians, internal difficulties with military and politics, and the split of the empire all contributed to its fall. 

Is this multipile choice?