Concept:An antonym is a word opposite in meaning to another word, and the correct choice must fit the sentence logically.
Explanation:The underlined word is “Inquisitiveness.”
It means curiosity or an eager desire to ask questions, investigate, and learn new things.
A person who shows inquisitiveness is actively interested in discovering more about something.
To fill the gap with the most nearly opposite meaning, we must find a word that expresses a lack of this curiosity or concern.
“Indifference” means lack of interest, concern, or enthusiasm.
This is directly opposite to inquisitiveness, which is driven by interest and curiosity.
The other options do not match: “noisiness” relates to loudness, “calmness” relates to stillness, and “dullness” relates to lack of sharpness or excitement.
Therefore, “indifference” is the correct word for the gap.
Answer:A. indifference