Concept:Rainfall is highest in countries with tropical wet climates and coastal rainforest areas.Explanation:Liberia lies on the Atlantic coast of West Africa and experiences a tropical wet climate.It receives heavy rainfall throughout the year due to moist southwest monsoon winds and rainforest vegetation.In contrast, Algeria and Mali are dominated by desert and semi-arid conditions.Egypt also has an arid desert climate with very little rainfall.Since tropical coastal areas receive much more rain than desert regions, Liberia has the highest rainfall among the given countries.Answer:A. Liberia