What is not an example of upselling?

The choice focusing on refilling drinks is not an example of upselling because it pertains to service rather than sales enhancement. Upselling generally involves encouraging a customer to purchase a more expensive item or an add-on that increases the overall sale value.

Refilling drinks typically does not involve an additional cost or an upgrade to a more premium option; it's simply a part of the dining experience. In contrast, the other options all involve persuading the customer to opt for a higher-priced product or an enhancement, such as premium liquors or features that increase the cost of a meal. Therefore, the act of simply refilling a drink doesn't fit into the upselling category because it does not influence the customer's purchase decision toward a higher value.