Which of these brands is an example of a fast-food restaurant?

The selection of McDonald's as the correct example of a fast-food restaurant is justified by its longstanding reputation and business model focused on quick-service dining. Fast-food restaurants are characterized by their emphasis on speed, convenience, and standardized food offerings, which are typically prepared in advance for quick delivery to customers. McDonald's exemplifies this model with its menu of burgers, fries, and other items that can be served quickly, often through drive-thru and takeaway services.

In comparing McDonald's to the other choices, it stands out as the quintessential fast-food brand. While Starbucks offers quick service, its primary focus on coffee and beverages places it in a different category, more aligned with café culture rather than traditional fast food. Subway is also a fast-casual option, providing quick service with a focus on sandwiches, but it typically does not fit the classic fast food model as closely as McDonald's. Domino's, while known for its pizza delivery and carryout services, operates in a sector often categorized as pizza delivery rather than fast food in the traditional sense. McDonald's remains the archetype of fast-food, embodying the core attributes recognized in the category.