Which one of the following lakes of West Africa has become dry and turned into a desert?

Lake Faguibine in Mali is the correct answer because it was once one of the largest lakes in West Africa but has been almost completely dry since the 1970s due to severe droughts and sand encroachment. Lake Victoria is a common distractor due to its prominence, but it is located in East Africa and remains the continent's largest freshwater body, while Lake Volta is a functional man-made reservoir in Ghana. The core concept tested is the impact of desertification and climate change on the hydrography of the Sahel region.