3. Of the 100 people in Harry’s psychology class, 60 are education majors and 40 are psychology majors.

Yet when Harry first met a classmate named Sally, he guessed that there was a 90% chance that she was a psychology major because she had a poster of Sigmund Freud on her dorm room wall. Harry likely based his judgment on .

a. the affective heuristic

b. an algorithm

c. the representativeness heuristic

d. the availability heuristic