Which of the following statements is true about sour drinks?

Sour drinks typically consist of a balance of sour ingredients, generally citrus juices, and a sweet component, such as simple syrup or liqueur. Shaking these drinks is fundamental as it effectively combines the ingredients and incorporates air, leading to a smoother texture and a well-blended flavor profile. Shaking also chills the drink thoroughly, which is key to enhancing the overall drinking experience.

The other options, while associated with different types of drinks, do not accurately represent the preparation of sour drinks. Not all sour drinks are blended, as blending is usually reserved for certain styles of cocktails, like frozen margaritas. While garnishing can enhance the presentation of many cocktails, it is not a required element for sour drinks specifically. Serving sour cocktails warm is also uncommon, as these drinks are typically served chilled to provide a refreshing contrast to their sour flavors. Thus, shaking is the correct and necessary preparation method for crafting sour drinks.