Final answer:
The funeral director's claim about a coffin's superior quality is an explicit service promise, much like other guarantees and warranties that businesses provide to reassure customers of a product or service's quality.
Step-by-step explanation:
The situation described with the funeral director suggesting a more expensive coffin is an example of an explicit service promise. This is due to the fact that the director is providing a concrete assurance of the quality of the coffin, implying that it will better prevent the body from deteriorating compared to less expensive alternatives. Guarantees and warranties are similar forms of explicit assurances that sellers provide, offering clear expectations to customers about the service or product quality. These explicit promises contrast with unstated guarantees that some businesses, such as movie theaters or restaurants, may offer, like refunding a ticket or exchanging dishes without formal policies.