Final answer:
West Africa is a region characterized by ethnic diversity and a significant agricultural way of life. People in the region are moving from rural villages to urban areas.
Step-by-step explanation:
West Africa is a region that is characterized by a high degree of diversity in terms of ethnic groups, languages, and cultures. The region is home to hundreds of different indigenous ethnic groups, each with its own language and culture. This diversity is a result of the historical and geographical factors that have shaped the region over time.
Contrary to option a), there are not only a few ethnic groups that live in the region, but rather a wide variety of ethnic groups. Option b) is also not true, as agriculture is still a significant way of life for people in West Africa, particularly in the rural areas. Option c) is not entirely accurate either, as the kinship systems in West Africa vary across different ethnic groups, and not all groups are based on matrilineal lineage. However, option d) is correct, as the region has experienced a significant migration of people from rural villages to urban areas in recent years.