Final answer:
Christianity and Islam are the two religions that have expanded dramatically into Africa, adapting to and sometimes integrating traditional African practices.
Step-by-step explanation:
The religions that have made dramatic expansions into Africa in areas once primarily associated with traditional religions are a) Christianity and Islam. These monotheistic belief systems have spread throughout Africa by various means, including military conquest, commercial exchange, and cultural diffusion. Their expansion was not always straightforward and they often adapted to African traditional practices and rituals. Christianity and Islam are proselytizing religions, actively seeking to increase their number of adherents, with Islam being the fastest-growing among these traditions. In the case of Sub-Saharan Africa, while Islam is predominantly found in the north, Christianity and traditional animist beliefs are more common in the south, contributing to a complex cultural and religious landscape.