Answer:
B. cross-selling
Explanation:
Cross-selling is a business technique that consists in offering and selling a new product to an existing customer.
In this case, AFLAC, Inc is using cross-selling because its sales representatives will specifically target customers who already have some sort of service with the firm.
It is important for AFLAC, Inc to offer an additional product that actually enhances the value for the customer. Otherwise, the firm risks disrupting the relationship with its customers, and could even lose some of them.