They stop the Germans advance in Stalingrad
Another effect of the spread of Islam was an increase in trade. Unlike early Christianity, Muslims were not reluctant to engage in trade and profit; Muhammad himself was a merchant. As new areas were drawn into the orbit of Islamic civilization, the new religion provided merchants with a safe context for trade.
Buddhism is a very peaceful religioun, I doubt it would be spread by violence
Answer:
I think that the answer may be c
