Why is the Nile River one of the most geo-political rivers in the world?

The Nile River is one of the most geopolitically significant waterways in the world. It's the lifeblood of Egypt and runs through 10 African countries, providing a regular source for conflict over water rights and distribution. Egypt could not survive without the Nile

The answer i think is d

Answer barren with few trees, in the northern hemisphere;