Answer:
Correct answer is a. Marched into Babylon for resources.
Explanation:
Option A is not correct as Popes never started any campaign in that direction. The farthest they went was the call for Crusades to deliberate Holy Land.
Option B is correct as they have called for Holy wars to protect their influence, power and domain.
Option C is also correct as Popes very often were even able to overthrew the rulers of certain countries.
Option D is correct as Popes were among the richest people, especially after church gained a lot of possessions in the Middle Ages.