What is the most important reason that christianity is so geographically widespread? a. the emigration of christians to non-christian areas around the world b. the conquest of non-christian areas by christian colonial powers c. trade between christian nations and nations of other faiths d. the increased availability of new technology and forms of communication

Christianity was spread around the world through a number of different methods including missionaries, person to person through trading routes, and also through military conquest. It is fair to say however, that overall the conquest of non-Christian areas by Christian colonial powers (B) was the major force that led to the widespread diffusion of Christianity around the globe. 

What effect did the development of trade have on settlement patterns in medieval times