Finish the following sentence with the best choice: What ingredients are used to make a simple royal icing?

Choices:
- Powdered sugar, whole milk or water, and egg yolks are the ingredients used to make royal icing.
- Powdered sugar, whole milk or water, and egg whites are the ingredients used to make royal icing.

Answer:
Powdered sugar, whole milk or water, and egg whites are the ingredients used to make royal icing.