For your first question regarding the impact of trade on the people of Southern and Eastern Africa, the response that best exemplifies this impact is:
"Millions of people in East Africa speak a form of Bantu."
This reflects the influence of trade routes and interactions that facilitated cultural exchange and linguistic development in the region.
For your second question about comparing and contrasting different types of trade barriers, the most accurate response is:
"Tariffs are taxes on imports, quotas are restrictions on the quantity of imports, and embargoes involve a complete prohibition of trade with a specific country."
This clearly explains the distinct definitions and implications of tariffs, quotas, and embargoes in international trade.