Which of the following is an example of a formal closing line?

• A. See you next week
• B. Warm regards
• C. Sincerely
• D. Later

Answer: (C)

Closing lines at the end of a letter or email establish the tone of the wrap-up. A formal closing uses standard, respectful phrasing that fits professional communication. Sincerely is the best choice because it is the traditional, neutral sign-off used in formal business letters and emails. It communicates professionalism without personal flair, making it suitable for first contacts, job applications, or official correspondence. The other options lean toward informal or casual tones: "See you next week" suggests an ongoing personal plan; "Warm regards" is polite but a bit warmer and less formal; "Later" is casual slang and not appropriate in formal contexts. After a closing, you typically put a comma and your name on the next line.