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

"how close the students lived to one another."

Explanation:

In the study conducted in the 1950s, social psychologist Leon Festinger and colleagues established their proximity theory, which states that individuals tend to forge friendships with those who live close to them. People who are close by, have more chances to develop a strong interpersonal relationship rather than those who live far away from each other. Probably, this is due to how frequently people can meet.