Answer:
D) normative control
Step-by-step explanation:
In business, normative controls refers to the practice of managing human resources using actions that shape their behavior. This type of approach focuses on behavior standards or norms more than on actual written policies. Sometimes the norms can even be informal, but that doesn't mean that they are less important.
In this case, Curtis pays a lot of attention to how his employees treat their customers and trains them to do it a certain way that he considers to be effective.