The correct answer is: A. I was hurt deeply by his comment.
The other options are incorrect because:
B. I could be hurt deeply by his comment is in the passive voice and does not express the speaker’s feelings.
C. His comment was hurtful is a statement of fact, not an expression of the speaker’s feelings.
D. I should not be hurt by his comment is a judgment about the speaker’s feelings, not an expression of those feelings.
The speaker is expressing their feelings of hurt and pain in response to the other person’s comment. They are using the first person pronoun “I” to indicate that they are the one who is feeling hurt, and they are using the past tense verb “was” to indicate that the hurt occurred in the past. The speaker is also using the adverb “deeply” to emphasize the severity of their hurt.