What were the 3 main causes of the crusades?

Although the central purpose of the Crusades was to get the charge of Jerusalem off from the Muslims, there were several causes why European knights and others were prepared to go and confront a combat in a different land.

i thinl it is the 1st answer

lee and grant, both of whom held the highest rank in their respective armies, had known each other slightly during the mexican-american war (1846-48) and began their dialogue by exchanging awkward personal inquiries. characteristically, grant had arrived in his mud-splattered field uniform while lee had turned out in full dress attire, complete with sash and sword.

explanation: