What type of beverage is represented by the code "E"?

The beverage represented by the code "E" is espresso, which is a concentrated coffee brewed by forcing a small amount of nearly boiling water through finely-ground coffee beans. This method produces a strong and robust flavor profile, which is characteristic of espresso.

Espresso serves as the foundation for many other coffee beverages, such as lattes, cappuccinos, and macchiatos, due to its rich texture and potent coffee flavor. Understanding this makes it clear why "E" corresponds to espresso specifically—it encapsulates the essence of coffee in a concentrated form. The other options, while also popular coffee beverages, do not directly align with the code "E" as they each have distinct preparation methods and flavor profiles that set them apart from espresso.