Sweet flavors alert us to foods that a. provide an energy boost b. are full of empty calories c. will release serotonin d. will likely taste good

Option C. Will release serotonin. Serotonin is a chemical nerve cells found in the digestive tract and the brain that has been linked to many complex mental functions including sleeping and appetite. The aroma stimulates neurons in our nose; the neurons in the nose carry information about the identity and intensity of the odors to the olfactory lobe and then to the brain which releases serotonin.

I just took the quiz and it said that C was wrong and that A was the correct answer.

“a word or group of words containing a noun and functioning in a sentence, object or prepositional object” basically a phrase that has a noun as its head or that preforms the same grammatical function as a noun.