Which cocktail is a blend of rum, lime juice, and sour mix?

The cocktail that is a blend of rum, lime juice, and sour mix is the Daquiri. This classic drink typically consists of light rum, freshly squeezed lime juice, and a sweetener which can often be a simple syrup or sour mix, creating a refreshing and balanced beverage.

The Margarita, on the other hand, features tequila, lime juice, and triple sec, making it distinctly different from the Daquiri. The Blue Hawaiian consists of light rum, blue curaçao, pineapple juice, and sweet and sour mix, which is also not aligned with the ingredients for a Daquiri. Lastly, the Greyhound is made from vodka and grapefruit juice, further confirming that it does not include rum or lime juice.

Understanding the specific ingredients required for each cocktail helps clarify why the Daquiri is the correct answer in this context.