The Emphasis on Visible Works of Christian Piety and Devotion

The emphasis on visible works of Christian piety and devotion in the High Middle Ages served to:

A) clearly distinguish Christian groups from their non-Christian neighbors.
B) introduce a sense of brotherhood among all medieval Europeans, regardless of religious and ethnic affiliations.
C) run counter to the interests of the Roman papacy.
D) minimize the importance of rituals such as confession and the Eucharist.
E) identify heretics who did not participate in such activities.