As a young child, Melissa spent the night with her grandparents on several occasions. Early in the morning, Melissa would awaken to the smell of coffee, get out of bed, and enjoy a fantastic homemade breakfast her grandmother had fixed. As an adult, Melissa does not drink coffee, but whenever she goes down the coffee isle at the grocery store, she has a warm, fuzzy feeling.

What is the Unconditioned Stimulus for Melissa in this example?

walking down the coffee isle

getting out of bed

the smell of coffee at Grandma’s house

eating a delicious breakfast