What is added to the top of a Venti caramel ribbon crunch frappuccino?

The correct choice is caramel sugar, which is a signature element of the Venti caramel ribbon crunch frappuccino. This beverage features a combination of caramel sauce and a crunch topping that includes bits of caramel. The use of caramel sugar on top enhances the overall flavor profile by adding a sweet and rich layer that contrasts with the creamy texture of the frappuccino base.

This topping is part of what makes the drink special, as it not only adds sweetness but also a visual appeal that reflects the caramel theme of the drink. The other choices, while they can be found on various menu items or toppings at Starbucks, do not specifically pertain to the caramel ribbon crunch frappuccino.