The correct answer is: The Soninke
The Kingdom of Ghana had it's existence from 750 to 1076 A.D. approximately. It covered the region of what nowadays is southeastern Mauritania, western Mali, and eastern Senegal. Their founders were the Soninke, traders who "capitalized on the ideal location of Ancient Ghana", this in order to stablish relationships with caravans in the north and gold traders in the south. As a result the Kingdom of Ghana became rich, they exported ivory, salt and gold. This region was called Wagadou by their founders.