Question

At age 17, jerome aspired to become a serious musician. his group of friends began to change as he grew closer to students with deep musical interests, and he drifted away from other friends who were more engaged in sports. this illustrates peer _____.

Answer 1

based on the description, i believe this illustrates peer Selection
Peer selection refers to the tendency to build a relationship with other people that bring possitive impact to our personal interest.
In this case, Jerome choose to hang out with the musical friends because they shared similar interest and jerome feel that he could learn a lot from them