The correct answer is D. A character who acts in opposition to the main character
Explanation:
In literature, an antagonist is usually an important character in the story who opposed the protagonist or main character. Indeed, the main role of antagonist is to create a conflict for the main character, to act against him or her and to show opposition in terms of points of view, behavior, and actions. Due to this, most antagonists are considered to be an evil presence in the story, although it is still possible the antagonist is not evil or even a protagonist turns into an antagonist under specific circumstances. Considering this, it can be concluded the antagonist is "a character who acts in opposition to the main character".
