Which sizes use an 8oz mixline for the energy drink?

The correct choice indicates that the 8oz mixline for the energy drink is used exclusively for the small size. This reflects the specific measurement guidelines for how energy drinks are mixed and served in various cup sizes. In many drink preparation contexts, smaller sizes often have distinct mix lines to ensure that the correct proportions of beverages and energy drink concentrate are maintained, allowing for a balanced flavor profile and consistent caffeine content.

In this instance, the small cup is designed to accommodate the 8oz mixline effectively, allowing for the right amount of the energy drink to be served. Other sizes, such as medium and large, typically use different mixlines to cater to the greater volume, which ensures that drinks maintain the overall quality, taste, and intended effect. Thus, for the small size, featuring an 8oz mixline, the option is correctly identified.