According to Carr what is the problem with "memory maids" defense used by those who see nothing wrong with heavy internet usage?

The problem is that it stimulates the underutilization of the brain and the waste of all its potential.

Explanation:

Nicholas Carr states in his text that memory is something built that must be stimulated and trained in order to be efficient. This causes our brain to develop and use all the potential that we know it has. With memorization, we are able to learn about everything, but memorization is decaying, since we are relying on memory devices that are becoming increasingly popular with the advancement of technology and that are extremely stimulated and defended by the people who make them. the intense use of the internet.

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.