The answer is B, they conquered
A and B both are true about the Greek religious belief.
I would say that the most likely reason is <span>a high birth rate. There's usually a higher birth rate in less developed countries. The higher the birth rate, the more young children, the smaller number of </span><span>an ageing population. </span>
Significant conversions also occurred beyond the extents of the empire such as that of the Turkic tribes in Central Asia and peoples living in regions south of the Sahara in Africathrough contact with Muslim traders active in the area and Sufi orders.