Answer:
D. It is located far from a major river or major desalinization plant.
Explanation:
"Tripoli" is Libya's capital city. If you happen to see the map, the city is located far from a major river or major desalinization plant. This is because, the place lacks in rainfall which makes it harder to form permanent rivers. Such problem clearly shows the need to address its access to groundwater.
"The Great Man-Made River" was made established in 1892 in order to address the water problem in the area. These pipelines supplies water to the different parts of Libya (including Tripoli).