How does the experiment further our understanding of chimpanzees? A. It proves that chimpanzees like helping others, but not giving up what they have.
B. It shows that chimpanzees are able to act in surprisingly unselfish ways.
C. It reveals that chimpanzees need some prompting to act selflessly.
D. It proves that chimpanzees aren’t driven by their own needs or desires.

A

Explanation:

I don't know what the experiment is, but if I had to choose it would be that one.

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.

basic principle: a pronoun usually refers to something earlier in the text (its antecedent) and must agree in number — singular/plural — with the thing to which it refers. the indefinite pronouns anyone, anybody, everyone, everybody, someone, somebody, no one, and nobody are always singular.