Every Week Jade Spends Her Allowance on 225 Grams of Sour

Every week Jade spends her allowance on 225 grams of sour lemon gummy candies even though they always make her mouth water. One day, as she is walking down the street, Jade sees a girl carrying a little white bag that looks like a candy shop bag! Jade notices that her mouth is puckering and overflowing with saliva. In this example, the unconditioned stimulus is the:

A) little white bag.
B) allowance money.
C) puckering and saliva.
D) sour lemon gummy candy.