Which of the following is the best example of scalfolding?

Howard and Priscilla buya Wii for their $5-$year$-$old daughter Rebecca. They set it up for herand then allow her to fugure out how to tum it on and use the remote: Een places the ingredients in the bowl and mives them tagether with a spoon.

David helps his son build a model airplane by arsembling it while his son watches.