The word that is a synonym for "belligerent" is:
A. aggressive
Explanation:
1. "Belligerent" means hostile, aggressive, or ready to fight.
2. A synonym is a word that has a similar meaning to another word.
3. In this case, "aggressive" shares a similar meaning with "belligerent" as both convey a sense of being confrontational or hostile.
Therefore, the correct answer is A. aggressive.