You are composing an email to your professor requesting an extension for your research paper. Which of the following options provides a polite and concise request, explaining your situation effectively?
- A "Hey, can I have more time for the paper? I've been busy lately."
- B "I need extra time for my paper. Can you give me an extension?"
- C "I didn't manage to complete the paper. Can I get an extension?"
- D "Due to unforeseen circumstances, I kindly request an extension for the research paper deadline."