The Different Schedules of Reinforcement Produce Different Patterns of Responding

Multiple Choice

The different schedules of reinforcement produce different patterns of responding. In the graph shown, what do patterns C and D share in common?

A) They are both fixed schedules of reinforcement.
B) They are both variable schedules of reinforcement.
C) They are both ratio schedules of reinforcement.
D) They are both interval schedules of reinforcement.