Katrina was disappointed because Dr. Girourd and Dr. Kutner (was, were) closing their practice.

Were

Explanation:

Since there are two people we are talking about, they were closing up practise. "Dr. Girourd and Dr Kutner was closing their practise" doesn't ring quite as well as if you were to say they *were* doing something.

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.

this questions means lavender