Explanation:

- Correct Answer: Option 3 - seventh century

- ?? Prophet Muhammad founded the faith of Islam in the seventh century. He began receiving revelations around 610 CE in Mecca.

- Option:1 - sixth century

- Before the founding of Islam, the sixth century was dominated by other religions like Christianity, Judaism, and various pagan beliefs in the Arabian Peninsula.

- Option:2 - eighth century

- Islam had already been well-established by the eighth century. By this time, the Islamic empire was expanding rapidly beyond the Arabian Peninsula.

- Option:4 - ninth century

- By the ninth century, Islam was a major world religion with an extensive following across many regions.