Which of the following compounds is most acidic? 
Definitions:
Variable-Ratio
A schedule of reinforcement where a response is rewarded after an unpredictable number of responses.
Reinforced
Strengthened behavior through the application of a stimulus (positive reinforcement) or the removal of an undesirable stimulus (negative reinforcement).
Potential Partners
entities or individuals considered for collaboration or engagement in a specific context or project.
Fixed-Interval
Refers to a schedule of reinforcement where the first response is rewarded only after a specified amount of time has elapsed.
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