Muhammad's new religious community became the official religion in Arabia and Persia through willful conversion and military expansion.
Explanation:
Once Muhammad started of the Islam, he made a base of followers. He found it hard at the beginning, but eventually managed to convince the Arab tribes to convert to the new religion. One by one the Arabs adopted the Islam, and with it, they unified, which is a major turning point.
As the Arabs were united, and the surrounding empires were on the decline, Muhammad decided that a military offensive is needed so that the Arabs form and empire and spread out the Islam further. The military expansion was a huge success for the Arabs and the Islam, and in a very short period, the new religion spread out in all direction.
The regions that were affected were:
- Persia
- Northern India
- Central Asia
- Asia Minor
- Northern Africa
- parts of Western Africa
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I believe the answer is C.
