What impact if any did the Roman Empire have upon Germanic barbarians?

What impact if any did the Roman Empire have upon Germanic barbarians?
 
  A) The Germanic tribes were under constant attack on the border abutting Rome, strengthening their desire to rise and conquer the Romans by adopting their military techniques to best defeat them.
  B) They became stronger in their desire to trade with the Romans, thus promoting the adoption of Roman customs.
  C) They became wealthier, highly organized, and militarily stronger as a result of neighboring Rome.
  D) The Romans had no impact upon the barbarian tribes.
  E) The Germanic tribes adopted many religious deities as their own in the process of trade and contact.