The crusades fought for control of Jerusalem. Both Muslims and Christians hold Jerusalem as the "Holy Land" and the crusades fought for who would control the city and region. It was a common of the Pope and the Church to unite the nobility(who were constantly warring with each other) and people of Europe together against a common enemy. Pope Urban, the second, told the people, "All who die by the way, whether by land or by sea, or in battle against the [Muslims], shall have immediate [forgiveness] of sins." So your answer is B.