Just by looking at this question, and the answer choices, you can determine that the least formal answer is A. Kicking back. This is because when you think of formal, you think of respectful and professional. Answers "C," and "B," are things that one may say in a formal/professional way to someone. However, people don't normally use the term, "kicking back," as a formal use of speech.
Answer: I think it means, the person who wrote the song wishes that they could be enough for a loved one or a friend, but can't provide that friend or family's needs, so they will still be with them, and provide what they can to the person.
