Answer: B) sound of the can being opened
Explanation:
Conditioned stimulus is the earlier neutral stimulus that happens to trigger conditioned response while combining with unconditioned stimulus.
According to the question, conditioned stimuli is sound of opening the can' lid because earlier the can was neutral but after it made the opening sound, it triggered conditioned response in cat so she came running in kitchen.
Other options are incorrect because food can, presence of person and cat running is not the neutral stimulus that is not getting connected to unconditioned stimulus.Thus, the correct option is option(B).
