Which sentence uses a contraction incorrectly? Abc
Who's trash is that in the corner?
He's ready for his solo piano performance.
Most cats stalk their prey at night, but ours doesn't.
My memory of the event was very vivid, but hers wasn't.

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i love to sleep it's the best

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.