On the first day of practice for the school band, Cory introduced himself to the group. "Hi everyone. I play the trombone, which was not an easy instrument to learn. But I wanted to try it because my grandfather played trombone when he worked for an orchestra. Since I picked up the instrument, we have even played together a few times! Also, I wanted to let you all know that I’m trans and use the pronouns he and him. I think this is going to be a great year!”Which detail about Cory is part of belonging to a social group?