Answer:
The correct answer is A) Through military conquest and trade
Explanation:
While the religion of Islam started from the Hejaz Area of the Arabian Peninsula, it's growing power saw it expand very quickly into an Empire that stretched 3 continents.
While military conquests did help the empire to grow, it's economic might and trade were responsible for the religion, language, culture, food and philosophy to reach far away places.
This included as far west as Spain and as east as China and Malaysia.
Today, the most populous Muslim country in the world is Indonesia, which was never conquered by any invading forces and the local population converted to the religion gradually over hundreds of years.
