Which Is an Example of Scaffolding

Which is an example of scaffolding?

A) David helps his son build a model airplane by assembling it while his son watches.
B) Howard and Priscilla buy a Wii game system for their 5-year-old daughter Rebecca. They set it up for her and then allow her to figure out how to turn it on and use it.
C) Richard buys a do-it-yourself kite kit for his 6-year-old daughter Angela. He lays all of the pieces out for her and then allows her to read the instructions and follow them herself.
D) Miriam helps her son Ben to make cookies. She measures all of the ingredients out and places them on the counter in small bowls. She reads the recipe aloud as Ben places the ingredients in the bowl and mixes them together with a spoon.