Final answer:
Option B correctly describes the ethnic patterns in Africa, where no single ethnic group usually constitutes a majority due to the region's high diversity.
Step-by-step explanation:
Among the provided options, the most accurate statement regarding ethnic patterns in Africa is B. In most African countries, no single ethnic group makes up the majority of the population. This is due to the remarkable diversity in the region, with hundreds of different indigenous ethnic groups, each with its own language and culture. It is not accurate to say that members of ethnic groups always practice the same religion (Option A), as religious activity is divided amongst Christianity, Islam, and traditional beliefs, sometimes even within the same ethnic group. Members of ethnic groups, contrary to Option C, often share the same language. Lastly, ethnic minorities in African countries are not typically recent immigrants or the descendents of immigrants (Option D); many have been present in their regions for centuries, with colonialism and post-colonial migration impacting demographics.