If you’re writing a story, keep asking questions until you get the answer you want.
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the answer should be:

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

i believe it is the first choice (1.)

because the major theme is(“both the wild and civilization have rules.”)

and also as u said,( based on what buck learns within the call of the wild, "both the wild and civilization have rules".this is true of humans within society as well.