Which was a reason for the First Crusade?

AMuslim caliphs wanted to overthrow the Jewish kingdom that had been established in Palestine.
BEuropean merchants wanted to establish trading outposts in Muslim territories of the Middle East.
CWhen the Seljuk Turks took control of the Holy Land, it became more dangerous for Christians to travel there.
DThe pope called for the destruction of the Eastern Orthodox church at Constantinople.

Verified Answer :

"c. When the Seljuk Turks took control of the Holy Land, it became more dangerous for Christians to travel there" would be the best option, since most of the Crusades were largely about "taking back the Holy Land".

The answer is C. When the Seljuk Turks took control of the Holy Land, it became more dangerous for Christians to travel there.