Answer :
Answer:
Due to trade between Muslim merchants and non-Muslim traders.
Explanation:
The Arabian Peninsula’s importance as a trade center responsible to the spread of Islam in the neighboring regions because the Muslim merchants interact with the non-Muslim traders when they came to Arabian Peninsula for trade or the Muslim merchants go to their cities for the purpose of trade. To see the honesty of Muslim merchants, the non-Muslim traders accepted the religion of Islam. So we can say that spread of Islam occurs due to the trade center of Arabian Peninsula.