Answer: Conditioned stimulus
Step-by-step explanation:
A conditioned stimulus is a stimulus which is used for the purpose of conditioning and training pets. The conditioned stimulus is false stimulus is given to pet at repeated times so that the pet show some activity when treated along with unconditioned or natural stimulus.
According to the given situation, the rabbit is conditioned and habitual to interpret the crinkling sound of food or unconditioned stimulus but when it hears the crinkling sound of chips which is a conditioned stimulus it also reacts in the same way as that of unconditioned stimulus.