ASAP! GIVING BRAINLIEST! Please read the question THEN answer CORRECTLY! NO guessing. I say no guessing because people usually guess on my questions.

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.

the answer should be:

the intervention of the supernatural gives gilgamesh hope that he will defeat humbaba.