Historians believe the armies of the Islamic caliphates met less resistance because they: only claimed territories when the people overthrew their own governments.
allowed conquered peoples to practice their own religions.
adopted the language and religion of each new territory.
had a larger number of soldiers than any other territory in the world.

allowed conquered peoples to practice their own religions

Explanation:

Once stabilizing their position in the Arabian peninsula Arab Muslim forces expanded its authority into neighboring Byzantine and Sasanian empires territories. However, the success of Islamic leaders lives not only in their conquest but also in the process of stabilizing the new territories by the policy of religious tolerance. They allowed the Christian, Jews, and Zoroastrians to continues to practice their religion and it helped them to rule the conquered people easily.

answer: the answer is b

explanation: i just took this quiz last week

uncle sam would be tossing and turning in his grave : *)