Which of these best explains the crusades?

trained muslim warriors fought christian pilgrims in order to regain control of the holy land.

pope urban ii declared war on muslims and threatened christians with excommunication if they did not fight.

christians were promised entrance into heaven if they fought muslims for control of the holy land.

the catholic church wanted to protect christian pilgrims from muslim attacks.

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.