Concept:The Sahel Savanna is a semi-arid grassland with a severe and prolonged dry season.Explanation:Vegetation zones in West Africa range from the humid Guinea Savanna to the drier Sudan Savanna and the even drier Sahel Savanna.The Sahel Savanna lies close to the Sahara Desert, so it experiences very low rainfall and a severe, long dry season.Answer:A. Sahel Savanna