Question

islam spread quickly to asia, north africa, and ports along the mediterranean sea through
the early spread of islam (632 - 750 ad)
expansion during umayyad caliphate (661 - 750)
expansion during rashidun caliphate (632 - 661)
expansion under muhammad (622 - 632)
christians being forced to convert
missionaries sent by the byzantine emperor
trade and military conquest
the sharing of muhammads teachings by his apostles

Explanation:

Islam spread rapidly in the early period through trade routes that allowed for cultural - religious exchange and military conquests that established political control and facilitated the spread of the faith. There is no evidence of widespread forced conversion of Christians, and the Byzantine emperor did not send missionaries to spread Islam. Also, there were no apostles in Islam as in Christianity.

Answer:

C. trade and military conquest