How Did the Spread of Islam Affect Indian Ocean Commerce

How did the spread of Islam affect Indian Ocean commerce?

A) Islamic religious leaders decreed that Muslim merchants could have no dealings with non-Muslim traders.
B) Early rulers of the Arab Empire promoted trade within the empire by banning trade beyond its borders.
C) Islamic rulers were suspicious of merchants and succeeded in shutting down all trade on the Silk Roads.
D) Muslim merchants and sailors established communities of traders from East Africa to the south China coast.