Explanation:

The Nile River flows from south to north through eastern Africa. It begins in the rivers that flow into Lake Victoria, and empties into the Mediterranean Sea more than 6,600 kilometers to the north, making it one of the longest river in the world.

• In addition to Egypt, the Nile runs through or along the border of 10 other African countries, namely, Burundi, Tanzania, Rwanda, the Democratic Republic of the Congo, Kenya, Uganda, Sudan, Ethiopia, and South Sudan. Its three main tributaries are the White Nile, the Blue Nile, and the Atbara.
• Ethiopia, Sudan and Egypt agreed recently to resume negotiations to resolve their complex dispute over the Grand Renaissance Dam hydropower project in the Horn of Africa.
• The 145-meter-tall (475-foot-tall) Grand Renaissance Dam hydropower project, when completed, will be Africa’s largest.

Hence option 4th is correct.