Why Were Monasteries Important Institutions During the Decline and Fall

Why were monasteries important institutions during the decline and fall of the Roman Empire in the west?

A) Monasteries were the primary institutions that kept literacy and classical culture alive.
B) Most later European towns grew up around monasteries.
C) Monasteries retained most of the wealth accrued by the Roman world.
D) Monasteries were at the center of European social life after the fall of Rome.
E) By emphasizing spiritual purity rather than education,monasteries were centers of Christian religious enthusiasm.