An extended definition is a one or more paragraphs that attempt to explain a complex term.
Answer:
A. Kicking back
Explanation:
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.
A colon, when placed between two numbers indicates a ratio.
For example, 1:1 is saying that something is at a 1-to-1 ratio.
This would be better in the Math section though, but I'm happy to answer.