a wealth gap is an economic difference between nations. economic classes. businesses. governments.

Brief Explanations:

A wealth gap typically refers to the economic disparity between different economic classes within a society or across societies. It is not mainly about differences between individual businesses or governments in the context of the general concept. While there can be wealth - related differences between nations, the most common and fundamental context for the term is between economic classes like the rich and the poor.

Answer:

B. economic classes.