Define the term "antagonist" in literature.

In literature, the term "antagonist" refers to the character or force that opposes the protagonist, who is often the main character or hero of the story. This opposition is crucial for driving the narrative forward, creating conflict that adds tension and depth to the plot. The antagonist can take various forms, including a person, group, or even an abstract force, such as society or nature.

By encapsulating the role of the antagonist as the opposing force, option B provides a clear understanding of its function in storytelling. This dynamic is essential for character development, as the protagonist often undergoes significant change or growth in response to the challenges posed by the antagonist. Other definitions, such as describing the antagonist as an assistant, a type of setting, or a minor character with no influence, miss the vital aspect of conflict that is central to the antagonist's role in narrative structure.