The correct answers are:
B. Sudan;
E. Uganda;
The longest river in Africa, as well as in the whole world, the Nile, runs through the countries of Uganda, South Sudan, Sudan, and Egypt, White Nile that it is, while the Black Nile runs through the territories of Ethiopia and Sudan. This river is of extreme importance for all of the countries that it runs through, but especially for Sudan and Egypt. It is this river that enabled the conditions for the rise and development of one of the oldest and greatest civilizations in the human history, the Egyptian civilization.