Concept:Acacia trees are typical of tropical grassland regions with scattered trees.Explanation:Acacia thrives in hot areas that receive moderate rainfall and have clear wet and dry seasons.These conditions are found in the savannah belt of tropical Africa.Savannah lands support tall grasses along with scattered trees such as acacia and baobab.Hence, acacia is a common tree species in savannah lands, not in forests, Mediterranean zones, or mangroves.Answer:C. savannah lands