Non-Muslim Populations, Such as Jews and Christians, Often Lived in Separate

Non-Muslim populations, such as Jews and Christians, often lived in separate quarters of a city from their Muslim neighbors

A) because the Quran forbids Muslims from living alongside non-Muslims.
B) in order to provide protection for non-Muslim communities and allow their leaders a degree of independence.
C) in order to discourage the mixing of Muslim and non-Muslim religious beliefs.
D) so that the activities of non-Muslim communities could be closely monitored and regulated.