What is the difference between christainity and islam

While some similarities exist between Islam and Christianity (they are both monotheistic religions, for example), their differences are clear-cut, significant, and irreconcilable. For this article, we will survey four key areas: the founders of the two religions, the contrasting views of God, the sacred literature, and the means of salvation. We will see that Islam differs from Christianity in each of those four areas.

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.

yup! you are correct it is b.