Choices: +Slowly blend in the powdered sugar on low speed. Blend until the frosting becomes stiff, taking about 2-4 minutes.. +For fluffy frosting, add the powdered sugar last. Mix thoroughly, then just throw it into the bowl.. +Beat again, until well-combined. Blend all of the ingredients except the powdered sugar and vanilla to combine well, and then knead the mixture until fully incorporated.. +Continue mixing, adding the powdered sugar to the mixture gradually, being sure not to mix while beating. Add the raisins to the mixture..Choose from options above and answer: What most naturally follows?

How to make rainbow frosting 
Beat the butter in a large bowl using an electric mixer. 
Blend and cream well on a medium setting, mixing until the butter is fully whipped, taking about 2-3 minutes. 
Pour in the powdered sugar.
Answer:
Slowly blend in the powdered sugar on low speed. Blend until the frosting becomes stiff, taking about 2-4 minutes.