Final answer:
Sending inspectors to evaluate compliance is a means of enforcing regulation, typically under the command-and-control approach which mandates firms to consider the social costs of pollution.Therefore correct option is A
Step-by-step explanation:
One means of enforcing a regulation is sending inspectors to evaluate compliance. This method ensures that firms are following prescribed rules, such as those related to environmental laws that specify allowable quantities of pollution. For instance, the Environmental Protection Agency (EPA) may send inspectors to check if factories are emitting pollutants within the legally established limits or if they have installed the necessary anti-pollution equipment. This form of enforcement falls under command-and-control regulation, where legal requirements compel firms to account for the social costs of their operations, such as pollution.