Answer:
Response-b) your mouth watering at the sight of food on a plate
Stimulus-a) the recess bell ringing in an elementary school
Explanation:
An stimulus is somthing happening that causes a reaction in an individual, for example, when you see the person you like, you get nervous, the stimulus is the sight of the person you like, the response is getting nervous, so from the options a response is your mouth watering at the sight of food on a plate, and an stimulus would be the recess ringing in an elementary school, because that immidiately sets a response form the students to stand from their tables and run outside.
