What units of measure would most likely be represented by letters A-E on the bottom of the accompanying hydrograph? 
Definitions:
Fixed-interval Reinforcement
A type of schedule in behavioral psychology where rewards are provided after set periods of time for responses or actions.
Operant Conditioning
A learning process through which the strength of a behavior is modified by reinforcement or punishment.
Self-control
The ability to exert control over the variables that determine our behavior.
Token Economy
A behavior-modification technique in which tokens, which can be exchanged for valued objects or privileges, are awarded for desirable behaviors.
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