Which of the following would be an unconditioned stimulus (UCS) in experiments like Pavlov's?

Question

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An unconditioned stimulus (UCS) is a stimulus that naturally triggers a response without any learning. In Pavlov's experiments, the UCS was the food because it naturally elicited the salivation response from the dogs. Dogs (A) could be a possible answer, but it is too broad and nonspecific to be a correct answer. Praise (B) and sounds (C) are not naturally associated with the salivation response, and therefore are not UCSs.

Which of the Following Would Be an Unconditioned Stimulus (UCS)