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.
The Bedouin are Berber descendants, also known as "blue people"
I choose letter a. The Maasai. They settled in East Africa during the mid-19th Century. They were known for raising cattle as well being formidable warriors who were armed with shield and spear as well as throwing clubs. Even today they still continue their nomadic way of life.