Which of the following is NOT one of the smoothie flavors offered?

The correct answer is that banana is not one of the smoothie flavors offered. In the context of smoothie offerings, specific flavors are selected based on popularity, availability, and the brand's marketing strategy. Mango, green apple, and strawberry are commonly associated with many smoothie menus due to their appealing taste and consumer preference. Banana, while a popular ingredient in many smoothie recipes, may not be included as a standalone flavor in this specific establishment's offerings. This reflects how certain ingredients are highlighted or featured based on the unique menu design of Black Rock Coffee Bar, emphasizing distinct flavors that resonate more with their target audience.