Which Statement Best Characterizes Innocent III's Accomplishments

Which statement best characterizes Innocent III's accomplishments?

A) He strengthened the power of the papacy of the church and its clergy.
B) He was able to maintain a semblance of authority but in actuality owed his hold on the papacy to the will of European kings.
C) He was ineffective in using his authority despite several attempts to influence European kings.
D) He gave up much of the authority of the papacy to secular authorities in exchange for peace.
E) He was able to establish power by demanding that European kings be his vassals.