What does the cumulative recorder do in a Skinner box

A)  It delivers the reinforcers. 
B)  It creates a graphic record of operant responding across time. 
C)  It permits the experimenter to control the reinforcement contingencies. 
D)  It provides a complete record of everything the animal does.

Cumulative Recorder

A device used in behavioral psychology to record the frequency of behaviors over time, creating a graphical representation.

Graphic Record

A visual representation of data or information, usually in the form of charts, graphs, or diagrams.

Reinforcement Contingencies

Conditions that determine when reinforcement will be given for a particular behavior, crucial in the process of learning and behavior modification.