Which combination of smoothies can you order?

C is the correct choice because it reflects a combination of smoothies that align with Olive Garden's offerings. The menu often features a variety of flavors that can complement each other while allowing for a diverse taste experience. Strawberry and Peach Mango provide a balance of sweet and fruity tastes, making them an appealing choice together.

The other combinations include flavors that may not be consistently paired on the menu or are repetitive in flavor profile, making them less likely as a typical combination that customers would find on the Olive Garden menu. For example, Peach Mango and Mango may seem redundant as they share a similar base flavor, and Strawberry with Blueberry might not typically be featured together. Fruit Medley and Citrus may not be standard or commonly available together. Therefore, the combination of Strawberry and Peach Mango is the most appropriate pairing based on the menu's offerings.