At Canossa in the Winter of 1077

Multiple Choice

At Canossa in the winter of 1077:

A) King Henry IV did penance before Pope Gregory VII.
B) King Henry IV captured Pope Gregory VII.
C) Pope Gregory acknowledged the military might of King Henry IV.
D) King Henry IV arrived,but Pope Gregory VII refused to see him.
E) Pope Gregory VII received Henry IV and they resolved their differences through negotiation.