The correct answer is D. Antagonist
Step-by-step explanation
The word antagonist is a term used to refer to something contrary or opposite. This term t is usually used in the field of literature or drama to refer to the character, force or element that opposes the protagonist or main character, and therefore the entity that creates the main conflict. Its origin dates back to ancient Greece where it was used to refer to the opposite or contrary. Another use of this word is as a synonym for a rival, opponent, enemy, among others. So, the correct answer is D. Antagonist.