The word "belligerent" in the sentence can be replaced with "quarrelsome", since the two words have the same meaning, as further explained below.
What is the meaning of "belligerent"?
The adjective "belligerent" means quarrelsome, antagonistic, or aggressive. It is a word originated from the Latin "belligerare", which comes from "bellum", meaning war.
We can conclude, thus, that among the answer choices provided the best one to replace "belligerent" is "quarrelsome."
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