Mom Tells Billy That She Will Pay Him to Pull

Multiple Choice

Mom tells Billy that she will pay him to pull weeds from her flower garden.Because Mom is busy,she sometimes gives Billy a dime when he pulls five weeds,sometimes when he pulls 10 weeds,and other times when he pulls 20 or more weeds.The reinforcement schedule Mom is using is:

A) continuous
B) fixed interval
C) variable ratio
D) fixed ratio