How was religious faith related to the military expansion of the Arab Empire?
A The military expansion of the empire was driven by a religious commandment to spread Islam far and wide.
B The military expansion of the empire was driven by the zealous desire to crush religious uprisings against the caliphate.
C The military expansion of the empire was the result of caliphs seeking to prove the extent of their faith by expanding their territory.
D The military expansion of the empire was the successful result of having a skilled army made up of soldiers whose strength came from their religious faith