Hello there!
Your question asks what the ethical culture of the state is.
Answer: B). The troopers are following a normative standard
The reason why the answer "B). The troopers are following a normative standard" is correct because this is the standard that the troops go by--for instance when they pull someone over.
The reason why it's a "normative" standard is because it is a norm that they go by, and the norm "Nine you’re fine; ten you’re mine" is normal to them.
Their motto "Nine you’re fine; ten you’re mine" means that when someone is going 9 mph over the speed limit, they're fine, but if they're going 10 mph over the speed limit, then they will get pulled over.
That's why in the text it says "if the posted speed limit is 55 mph, drivers can drive at a rate up to 64 mph without fear of getting a ticket", due to the fact that from 55 mph to 64 mph is only 9 mph above the speed limit. If the driver were to go 65 mph, then they will get pulled over.
To sum it up, it's just a "normative standard" for the state troopers to not give tickets to people going 9 mph over the speed limit, but only to those who go 10 mph over the speed limit.
I hope this helps!
Best regards, MasterInvestor