Once a stimulus has been determined to function as a reinforcer in a particular contingency, which of the following is likely to be true?

Once a stimulus has been determined to function as a reinforcer in a particular contingency, which of the following is likely to be true?
A .  The reinforcer should be adjusted to vary during the observation period.
B .  The reinforcer should be used with others in the immediate environment.
C .  The effect of the reinforcer may strengthen with relevant deprivation.
D .  The effect of the reinforcer will weaken if a variable interval schedule is used.

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Answer: C