What is the best choice of reagent(s) to perform the following transformation? 
Definitions:
Variable-Interval Schedule
A reinforcement schedule in operant conditioning where a response is rewarded after an unpredictable amount of time has passed, creating a variable pattern of reinforcement.
Fixed-Ratio Schedule
A schedule of reinforcement where a response is rewarded after a specified number of responses, leading to a high and steady rate of responding.
Variable-Ratio
A reinforcement schedule where a response is rewarded after an unpredictable number of responses, enhancing the response rate.
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