During the Expansion of the Islamic Caliphate,Muslim Rule Was Often

During the expansion of the Islamic caliphate,Muslim rule was often preferred to Persian or Byzantine because:

A) Muslim laws were less strict.
B) Muslim leaders were more tolerant of religious difference.
C) local Muslim rulers were considered better protectors than the governors from other empires.
D) Muslim rulers were believed to be more moral than Byzantine and Persian emperors.
E) Muslim rulers were regarded as better military leaders.