Which of the Following Is an Example of Monitoring and Enforcement

Which of the following is an example of monitoring and enforcement costs?

A) Isabel knows that other neighbors' sleep patterns must also be affected by the howling dogs in her neighborhood and sets out to find those neighbors.
B) Isabel is bound and determined to to find out which of her neighbors owns the howling dogs that are preventing her from getting a full night's sleep.
C) Isabel has to make sure that the owner of the howling dogs lives up to his end of the bargain and keeps the dogs quiet throughout the night, every night.
D) Isabel determines how much it will cost for her and her neighbors to bargain with the owner of the howling dogs to get the owner to keep the dogs quiet at night so everyone else is able to sleep.