Which Is NOT True of Back,Schmukle,and Egloff's (2008)study on the Relationship

Which is NOT true of Back,Schmukle,and Egloff's (2008) study on the relationship between proximity and friendship?

A) Students in a first-year psychology course were randomly assigned seats in the classroom and instructed to introduce themselves to the other students in their row.
B) One year later, the students were contacted again and asked to rate the intensity of their current friendships with the other students in the class.
C) Their research highlighted the weak effects of proximity in friendship formation.
D) Even a full year after the initial seating arrangement, participants rated students who were randomly assigned to sit beside them as closer friends than students who did not sit nearby.