In the context of operant conditioning, which of the following is true about a variable-ratio schedule of reinforcement?
A. In a variable-ratio schedule, the number of responses usually hovers around a specific average.
B. In a variable-ratio schedule, reinforcement is given only after a specific number of responses.
C. In a variable-ratio schedule, the focus is on the amount of time that has elapsed since one was rewarded.
D. In a variable-ratio schedule, the time between reinforcements varies around some average rather than being fixed.
Answer: A
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