When Della Goes to Las Vegas,her Granddaughter Has Difficulty Getting

Multiple Choice

When Della goes to Las Vegas,her granddaughter has difficulty getting her to stop playing the nickel slot machines.In fact,she sometimes will forego food and sleep in order to keep playing.Which schedule of reinforcement is Della operating under?

A) a fixed interval schedule
B) a variable interval schedule
C) a fixed ratio schedule
D) a variable ratio schedule