His manners are uncouth, while his wife's are ___________.

Step 1: Analyze the question The sentence uses the contrast word "while", so the blank needs a word that is the opposite of "uncouth", and it must describe manners.

Step 2: Understand the key word

• Uncouth means rude, crude, lacking good manners or polish.
• Its opposite is a word meaning polite, cultured, or well-mannered.

Step 3: Test each option

• A. clever – means intelligent. It describes the mind, not manners, so it doesn't fit.
• B. classic – means of lasting quality or traditional style. It is not normally used for manners.
• C. refined – means polite, elegant, cultured. It is a direct opposite of "uncouth" and collocates naturally with "manners" (refined manners).
• D. purified – means made clean or free from impurities. It is used for water, substances or the like, not behavior.

Step 4: Answer The best choice is C. refined. The sentence reads: "His manners are uncouth, while his wife's are refined."

Tip: In "contrast" questions, look for signal words such as while, but, whereas, however, although. They tell you to choose an antonym (opposite) of the given word. Also learn common pairs: uncouth ↔ refined/polished/cultured.