Which of the following is a responsible beer serving practice?

Communicating the alcohol by volume (ABV) to customers is a responsible beer serving practice because it provides essential information that helps patrons make informed decisions regarding their consumption. Knowing the ABV allows customers to understand how strong a beer is, which can influence how much they decide to drink. This transparency is part of promoting responsible drinking, as it enables individuals to gauge their limits and make choices aligned with their tolerance levels.

While there are other aspects of responsible service, such as checking identification and ensuring customers aren't over-served, providing ABV information directly supports the customer's ability to drink responsibly. This practice can contribute to a more informed drinking culture and encourages patrons to enjoy beer in moderation.