What was the final nazi offensive?
a. the battle for berlin
b. the battle of the bulge
c. the battle of normandy
d. the battle for warsaw

The correct answer from the listed possibilities is B - the Battle of the Bulge.

The Battle of the Bulge was the last biggest offensive that Germany undertook at the time. Although there was another offensive later on after the Battle of the Bulge, this one is considered to be the last from them.