Final answer:
Empathy is the determinant of service quality that involves having the customer's best interests at heart.
Step-by-step explanation:
The determinant of service quality that involves having the customer's best interests at heart is Empathy.
Empathy refers to the ability of service providers to understand and share the feelings of their customers. It involves showing genuine concern, listening actively, and providing personalized attention to customers.
For example, a customer service representative who actively listens to a customer's problem, expresses understanding and compassion, and takes appropriate actions to resolve the issue demonstrates empathy.