During the Crusades, which event was MOST DIRECTLY responsible for increased tensions between Byzantine and western Christians?

Question

a. The Byzantine emperor asked the pope for help. This request launched the first Crusade, but was not the most important cause of conflict
b. The Crusaders failed to retake the Holy Land. While the Crusades were ultimately unsuccessful, this was not the main cause of distrust between the two branches of Christianity
c. Crusaders attacked Constantinople on their way to Egypt. The sack of Constantinople in 1204 during the Fourth Crusade worsened the relationship between the Orthodox and Roman Catholic Churches and weakened the Byzantine Empire
d. The Crusaders won protection in the Holy Land only for western pilgrims. Richard I was able to briefly win protection for Christian pilgrims, but this was not the cause of western churches

Answer 1

The event MOST DIRECTLY responsible for increased tensions between Byzantine and western Christians during the Crusades is:

c. Crusaders attacked Constantinople on their way to Egypt. The sack of Constantinople in 1204 during the Fourth Crusade worsened the relationship between the Orthodox and Roman Catholic Churches and weakened the Byzantine Empire.

This assault significantly deepened the divide between the Eastern Orthodox and Western Catholic Churches and had lasting implications for Byzantine-Western relations.