Which of the following provides evidence that a CR is not completely eliminated during extinction?

Question

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Spontaneous recovery is the reappearance of a conditioned response (CR) after a rest period following extinction. This suggests that the original association between the conditioned stimulus (CS) and the unconditioned stimulus (US) has not been completely eliminated. Choices A, C, and D do not provide evidence that a CR is not completely eliminated during extinction. Partial reinforcement refers to a schedule of reinforcement where not every correct response is reinforced, but it does not relate to extinction specifically. Generalization and discrimination refer to the ability to respond to stimuli that are similar or different from the original CS, respectively, but they do not necessarily relate to extinction or the persistence of the CR following extinction.

Which of the Following Provides Evidence That a CR Is