13.
Which event occurred soon before the Great Schism of 1054 and helped cause the event?




A.
Pope Urban II authorized a disastrous expedition to conquer Jerusalem.








B.
Pope Clement V moved the seat of the church's power from Rome to Avignon.








C.
Pope Leo IX and Patriarch Michael Cerularius excommunicated each other.








D.
Pope Leo X ordered the sale of indulgences to fund repairs of St. Peter's Basilica.