How many shots of espresso come in a medium paper cup?

In a typical beverage serving size for a medium paper cup at coffee establishments, it is standard to have three shots of espresso. This is commonly recognized as the ideal amount to achieve a balanced flavor profile and strength that many customers expect from a medium-sized espresso drink. Three shots provide a robust coffee flavor while allowing for milk or other ingredients to blend seamlessly, resulting in a harmonious beverage.

The other answer choices do not align with general coffee serving sizes in this context. For instance, two shots may be more consistent with a smaller size or specific lighter options, while four shots would typically be reserved for larger sizes or specialized beverages that require an extra boost of espresso. Having zero shots would not make sense for a drink that is fundamentally espresso-based, especially in a medium cup.