What Was the Primary Cause of the Renaissance of the Twelfth

What was the primary cause of the renaissance of the twelfth century?

A) The university movement of the previous century
B) The reintroduction of many ancient philosophical and scientific works previously saved by Muslim scholars
C) The elaborate and dialectical writings of St. Thomas Aquinas
D) The generous financial support of scholars by new European monarchs
E) The renewed contacts with the Byzantine Empire after centuries of separation