Answer:
In 1095, Pope Urban II proclaimed the First Crusade at the Council of Clermont. He encouraged military support for Byzantine Emperor Alexios I against the Seljuk Turks and an armed pilgrimage to Jerusalem.
Step-by-step explanation:
So I think the answer is C. the Byzantine Empire asked for assistance defending against the Turks.
As found in the info I applied above ^
If wrong I'm sorry- I did do research on the topic