Which is the best example of a fundamental American value being put into practice?

A police officer decides not to give the mayor a ticket even though she was driving well over the speed limit.
A citizen takes a book off the library shelf and destroys it because the book’s ideas are “dangerous.”
A legislature passes a law prohibiting racial or sexual discrimination on the job.
A candidate for office cites his opponent’s religion as a reason not to vote for him in the upcoming election.