Despite the Fact That Conversions to Islam Were at Their

Despite the fact that conversions to Islam were at their peak, Abbasid power declined because

A) there were constant revolts of non-Muslims against forced conversion.
B) the empire had to resist nomadic pressures on the frontier.
C) the empire had become too big to rule effectively.
D) new religious practices developed that challenged the appeal of Islam.
E) there were frequent religious wars between the Sunnis and Shi'ites.