Answer:
B. culture
Explanation:
Medium is an agency or means of doing something. Literature, a medium is the physical structure in which the work is passed along.
Rhetoric is a bunch of techniques which one can use to convince the others of his or her point of view.
Genre is basically a category.
In the end, we have culture, which can be defined as: <em>"the customs, arts, social institutions, and achievements of a particular nation, people, or other social group."</em>