The correct answer is D) Millions of people in East Africa speak a form of Bantu.
The option that is an example of the impact trade had on the people of Southern and Eastern Africa is "millions of people in East Africa speak a form of Bantu."
The Bantu people are a large group of tribes that live in South an East Africa. Historians have identified more than 400 hundred ethnic groups from the Bantu. It is believed that such a number of Bantu people comprises 30% of the actual population in the continent. History research concluded that trade played an important role in the spread of Bantu languages all over Africa 4000 years ago.