For Rome, the most serious consequence of the invasion of the Huns was that the Huns devastated large parts of the empire.
Answer: Option C
Explanation:
The Huns that belonged to the Caucasus region entered into the western part of Rome with an intention of invading it in 451 AD. The Romans along with Visigoths fought with the Huns in what is today known as Catalonia.
The Huns defeated them and destroyed the western Rome which made it vulnerable to more invasions.