Answer:
Option: d. By pushing the Germanic peoples into the western Roman empire
Step-by-step explanation:
Huns and Goths were Barbarian tribes. Huns invaded the western Roman Empire by creating a domino effect, pushing the Germanic peoples (Goths) into Rome. Huns were the nomadic people who known for attacking whatever comes in their way. They drove the Goths towards the Roman Empire. These migrations destabilized the Roman Empire and helped the Huns to gain victory.