Answer:
D
Step-by-step explanation:
"The city was able to maintain decent amounts of food and water, and therefore was an important pit stop for trade caravans traveling along the Red Sea. This was especially important given the merchant culture of Arabia. Along with the port of Jidda, Medina and Mecca thrived through years of pilgrimage."
Many people stopped by and traded here, in Mecca, where Islam was founded and spread.