A. Massai
The Massai people are a seminomadic group, who are herder-warriors of the east African plains, they inhabit South Kenya/Northen Tanzania. The San Bushmen inhabit Southern Africa, and are not seminomadic; the Ga people are an ethnic group of Ghana and Togo, meaning this cannot be the answer as it is in West Africa; and the Zulu people again are South African and not nomadic.