If You Are "Shaping" a Child to Pick Up All

Multiple Choice

If you are "shaping" a child to pick up all his toys, what would you need to do each time the child does a better job of picking up his toys than he did previously?

A) model the correct behavior by picking up the remaining toys
B) give the child a closer approximation to the reinforcement
C) give the child a US
D) give the child a reinforcement