Which option represents a refillable iced coffee type?

The choice indicating a refillable iced coffee type is indeed the one that specifically includes the term "refill." This option is designed to clearly communicate that it pertains not only to iced coffee but also signifies that customers can enjoy subsequent servings without having to pay for a new drink each time, which is a common practice at Starbucks for certain drink types.

Refillable drinks such as iced coffee help maintain customer satisfaction by encouraging repeated purchases while also allowing customers to adjust their caffeine intake easily. The terminology used in this option reflects Starbucks' policies on refills, distinguishing it from the other selections, which do not convey this refillable concept.

While the other options may refer to iced coffee in some capacity, they do not highlight the fact that they are refillable, which is a key component in understanding the refill policy. This makes the selected answer the most accurate representation of a refillable iced coffee type at Starbucks.