The correct answer is C. Ethiopia to South Sudan
Step-by-step explanation
East Africa is a subregion of the African continent that groups the countries of the east of this continent. This subregion is made up of a total of 18 countries incluiding Ethiopia, Kenya, Madagascar, Malawi, Rwanda, Seychelles, Somalia, Sudan, South Sudan, Tanzania, Uganda, and Zimbabwe. In this subregion, there is an area known as the Eastern Highlands that takes this name because there is a large group of mountains most of these mountains are in the Ethiopian territory and reach the country of South Sudan. Therefore, the answer is C. Ethiopia to South Sudan.