Which question should be asked when characterizing the antagonist?
how do others respond to the antagonist?
when is the protagonist introduced?
who is the protagonist?

The question that should be asked when characterizing the antagonist is "How do others respond to the antagonist?" Option A is correct.

An antagonist is the character in a story who is against the protagonist.

The antagonist is opposed to, struggles against, or competes with another; opponent; adversary, in literature, it is the adversary of the hero or protagonist of a drama or other literary work.

The English word antagonist stems from the Greek antagonistēs.

.the definitions

.the number of syllables in the word

.the pronunciation of the word

.the parts of speech

.the foreign translations

showing or suffering from nervousness, fear, or a lack of confidence