You Are Watching a Cumulative Recorder That Is Connected to a Small

Multiple Choice

You are watching a cumulative recorder that is connected to a small disk in a chamber.The pigeon has been trained to peck the disk when a red light is turned on,and not to peck the disk when a green light is turned on.What should you observe when the green light is turned on,based on this information

A)  The pen on the cumulative recorder will start to move downward. 
B)  The cumulative record will be shaped like a staircase, rather than a series of scallops. 
C)  The slope of the line on the cumulative recorder will be shallower than when the red light is turned on. 
D)  The roll of paper in the cumulative recorder will stop moving.