What ingredient is blended into a Venti Orange Mango Smoothie along with the juice and milk?

In a Venti Orange Mango Smoothie, the ingredient blended along with the juice and milk is indeed 2 scoops of protein and fiber powder. This addition enhances the nutritional profile of the smoothie, providing a boost of protein and dietary fiber, which can help with satiety and overall health. The protein and fiber powder is designed to be a complement to the fruity flavors of the orange and mango, adding nutritional benefits without overwhelming the taste. The other options, while they may seem like reasonable ingredients in some contexts, do not align with the standard recipe for this particular smoothie. Therefore, focusing on the inclusion of the protein and fiber powder is key to understanding the balance and purpose of this item on the Starbucks menu.