In a well-known study conducted in the 1950s, social psychologist Leon Festinger and colleagues analyzed the friendship patterns among graduate students living in one of the dormitories at MIT. The researchers found that strongest predictor of friendship was ____.
a. how extraverted the students were
b. similarity in terms of hobbies and activities
c. similarity in terms of basic demographics (age, gender, being single versus married, etc.)
d. how close the students lived to one another