Concept:Southern Guinea Savanna is a major vegetation belt in Nigeria; it is the largest of all the biotic communities in the country.Explanation:The Southern Guinea Savanna covers a very large part of Nigeria.It is found in states such as Oyo, Osun, and Ekiti.It has many plant species and also contains trees, so the options saying it has no plants or no trees are incorrect.Its key distinguishing feature is that it is the largest of all the biotic communities in Nigeria.Answer:A. It is the largest of all the biotic community in Nigeria.