As the Muslim empire grew and the Abbasid dynasty came to power
(A) Muslim rulers were increasingly isolated because of advisors and harems.
(B) civil wars destroyed the unity of the empires as provinces broke away.
(C) the Shi'a doctrines were supported and spread by the caliphs.
(D) the caliphs increasingly brought distant provinces under central control.
(E) conversions to Islam declined.
Answer: A