What geographic feature might have prevented the spread of christianity to other areas?

The answer to this would depend on the place and time period we are referring to. Christianity originated in the Middle East, and from here, it spread all over the world. At its origin, Christianity's spread could have been complicated by some geographic features, such as the deserts of the Middle East. As it spread, it could have encountered other barriers, such as oceans and mountain ranges.

the answer is c.

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