If You Are Using "Shaping" to Increase the Likelihood That

Multiple Choice

If you are using "shaping" to increase the likelihood that a child will put away all his toys,what would you need to do each time the child does a better job of putting away his toys than he did previously

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