Festinger, schachter, and back (1950) traced friendship formations among couples in an apartment complex at mit. they found that residents were most likely to be friends with a) similar to them. b) of the same gender. c) who lived closer to them. d) whom their partners befriended first.

C)Who lived closer to them

Explanation:

Interpersonal attraction means a positive attitude or evaluations regarding another person. There are three main factors that affect it: Similarity in attitudes and personality, physical attractiveness and proximity.

Festinger, Schater an Back researched proximity by studying the patter of how people formed friendships in new housing development. They found that proximity played an important role in determining the growth of relationships and the people who encounter others doing the same chores such as cleaning house, putting out the trash etc are more likely to become friends with each other. Similarity mattered only in the terms of partners liking each other.