What is the role of a "barback" in a bar?

The role of a barback is primarily focused on supporting the bartenders in their tasks, making option B the correct choice. A barback helps ensure that the bar operates smoothly by performing various tasks such as restocking supplies, cleaning glassware, and maintaining the organization of the bar area. This support allows the bartenders to focus on mixing drinks and serving customers effectively.

While mixing drinks may seem like a potential responsibility for a barback, it is typically the bartenders who are tasked with that role. Serving customers is also mainly the bartenders' responsibility, as they are the ones directly interacting with patrons, taking orders, and providing recommendations. Creating cocktail menus involves creativity and expertise, which falls under the bartender’s purview, not the barback's. Thus, the barback's primary function is to assist the bartenders, ensuring that they have everything they need to provide good service to customers.