Answer: A. did not last a long time but through trade passed Islam onto Southeast Asia
Explanation: The Islamic Empires in the Indian subcontinent, such as the Delhi Sultanate and the Mughal Empire, did not have a long duration compared to other empires in history. The Delhi Sultanate ruled from the 13th to the 16th century, while the Mughal Empire lasted from the 16th to the 18th century. However, during this relatively short period, these empires played a significant role in spreading Islam in the region.
One of the key ways in which Islam was passed onto Southeast Asia was through trade. The Islamic Empires had extensive trade networks, which allowed for the exchange of goods, ideas, and cultures. Muslim traders and merchants from the Indian subcontinent traveled to Southeast Asia and established connections, introducing Islam to the region. Through these trade routes, Islam gradually spread and took root in countries such as Indonesia, Malaysia, and the Philippines.