The correct option is: "c.It kept people moving, enabling them to share their personal belief systems."
The Arab Muslims counted on their benefit with a firm religious conviction, a warlike cohesion inherited from the tribal world from which they came, a sufficient force to be able to overcome, a special tendency to know how to move and control the routes and also, a great ability to agree with the enemy. The fortified points were surrendered not only by the push of the arms but by the offer of benign capitulations that ensured respect for the personal, legal, religious and administrative situation of Christians, Jews and Mazdians, who immediately became protected ( Dimmi).
