Whenever Fred kissed Marilyn, he would get a whiff

Whenever Fred kissed Marilyn, he would get a whiff of her bad breath. Since that time, even though she now uses mouthwash, when he puckers up to kiss her he involuntarily winces as if in pain. In this scenario, what is the conditioned stimulus (CS)?A) the kissB) the winceC) the bad breathD) Marilyn

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