Which of the following is the most stable resonance contributor to acetic acid? 
Definitions:
Conditioned Stimulus
A previously neutral stimulus that, after association with an unconditioned stimulus, comes to trigger a conditioned response.
Chemotherapy
A type of cancer treatment that uses drugs to kill or slow the growth of cancer cells.
Nausea
A sensation of unease and discomfort in the stomach with an urge to vomit.
Secondary Punisher
A stimulus that has acquired punishing properties through association with other punishers.
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