Problem: (1) What separates friends from acquaintances? Need Assignment Help? (2) Studies show that there are several factors which influence whether people become close friends. (3) One important factor, according to researchers, is self-disclosure. (4) People tend to be drawn to others who share their feelings, private thoughts, and most personal information. (5) Another factor is reciprocity. (6) Someone who listens to the other person's self-disclosure and responds in a supportive way is more likely to become a friend. (7) Another key factor that helps friendship grow is frequent exposure. (8) People who see each other more often are much more likely to become friends. (9) This is why people's closest friends are often co-workers, classmates, and neighbors. B4. The third sentence of this passage provides a. the main idea. b. a major detail. c. a minor detail.