Concept:An antonym is a word opposite in meaning to another word. The gap must be filled with the word that is most nearly opposite to the underlined word.
Explanation:The underlined word is “insolent.”
“Insolent” means boldly rude or disrespectful.
So, we need a word that means showing respect or politeness.
Among the options, “respectful” is the nearest opposite because it means showing admiration and consideration for others.
“Cowardly” is about lack of courage, not rudeness.
“Humble” and “modest” mean having a modest opinion of oneself, which are not the direct opposites of insolent.
Therefore, “respectful” is the most suitable word to fill the gap.
Answer:B. respectful