Which drink option would typically be offered as a refill?

The Iced Tea Refill is typically offered as a refill because Starbucks has a specific policy regarding brewed teas and coffees. Specifically, they allow customers to refill their brewed beverages at a reduced price or even for free, depending on the drink and the customer's purchase. Since Iced Tea falls under the category of brewed beverages, it is common practice for baristas to offer refills on Iced Tea, which encourages customers to enjoy more beverage at a value.

In contrast, the other drink options listed—Peach Tranquility, Mango Black Tea Lemonade, and Oprah Herbal Chai—are usually not offered as refills. These drinks may be pre-packaged or individually prepared, rather than brewed in a large batch, making refills less common or non-existent for these specific selections. This distinction emphasizes why the Iced Tea Refill is the correct choice in this scenario.