Mr. Gupta said to his son, "Do not take up any responsibility unless you are confident you can do it."

• A. r. Gupta advised his son not to take up any responsibility unless he is confident of doing it.
• B. r. Gupta advised his son against taking up responsibility without completing it.
• C. r. Gupta advised his son to take up the responsibility of completing the task.
• D. r. Gupta advised his son not to take up any responsibility unless he was confident that he could do it.