Answer: c. customer relationship management
Step-by-step explanation:
Customer relationship management refers to efforts taken by the firm to improve the way the company treats or relates with its customers.
As the goal of all businesses should be to retain customers for life, managing Customer relationships in such a way that they feel well taken care of enough to be loyal is a key way of doing this.
This is what Marriott is doing. By taking care to understand and to appreciate their customers, they are taking care of them such that they will want to keep coming back for life.