Answer:
E, gummy candy
Explanation:
An unconditioned stimulus is any stimulus that can cause a natural unconditioned response, even if the organism has no prior experience with the stimulus.
In this scenario, Jade's mouth became puckering and overflowing with saliva, which is the Unconditioned response, at the sight of the bag that looks like a candy shop bag.
This shows that the sight of candy stimulated the unconditioned response. Therefore, the gummy candy is the unconditioned stimulus