I think its c. or a. but pretty sure its c. sorry i couldnt help
I believe the answer is A (correct me if i'm wrong please)
Answer:
Caesar's bridges across the Rhine, the first two bridges to cross the Rhine River on record, were built by Julius Caesar and his legionaries during the Gallic War in 55 BC and 53 BC. Strategically successful, they are also considered masterpieces of military engineering.
Explanation:
It was formed after WWI to keep peace.
The League of Nations failed soon after because the US didn't join.