Which of the following was a major contributor to the Protestant Reformation?

AEuropeans demanded that the Catholic Church reunify with the Eastern Orthodox Church.
BThe Crusades resulted in huge numbers of Europeans converting to Judaism and Islam.
CSome Christians lost respect for Catholic leaders who engaged in political power struggles.
DThe Black Death greatly strengthened most Europeans' faith in the Catholic Church.

Verified Answer :

It was that "C. Some Christians lost respect for Catholic leaders who engaged in political power struggles" that was a major contributor to the Protestant Reformation, since the Reformation was the first major successful challenge to the authority of the Catholic Church.

C. Some Christians lost respect for Catholic leaders who engaged in political power struggles.