Who started?
Who were involved?
Who gain or lose power?
Hope it helps best of luck.
I believe it's A.
The Muslims did control Jerusalem for a time, and I believe that they forced the Christians out of it.
Also the Crusaders did sack Constantinople when they were not allowed in by the government there.
I don't know what D is but I'll assume that it is true because I think A is false.
Answer:
I'm pretty sure it's c or d
