Concept: The blank requires an adverb that naturally intensifies the adjective “annoyed.”
Explanation:The sentence is “My mother was ___ annoyed with me for coming late.”
The word “very” is commonly used to strengthen adjectives of feeling, such as “very annoyed.”
“Just” would mean “only,” which does not fit the intended meaning.
“Neither” is used with two negative choices, so it is unsuitable here.
“Hotly” usually describes anger in a passionate or heated way, but “hotly annoyed” is not the standard expression.
Therefore, the best word to complete the gap is “Very.”
Answer: B. Very.