TC question from ETS GRE Verbal reasoning book

Need help understand how to solve this problem

, I am struggling with find the right strategy to apply here also found the solution given in the book a bot confusing.

Dictate is the answer.
Over here they are talking about norms in the first part of the sentence so they are saying it as Authoritative Standards

Now the blank is demanding normative ethics
So it should be synonym to authoritative correct

Therefore supporting that key idea Dictate is the best choice.

Hope this clarifies your doubt

Also correct me that my thinking is correct or wrong?