Don has an obsessive-compulsive disorder with obsessions that focus on germs. Don’s therapist asks him to shake hands with everyone in his office and does not allow him to wash his hands afterward. His therapist is engaging in, which works by .

Ryan tells ty that he will give him his best pokemon card in exchange for ty's autographed baseball card. ty feels this is a fair trade. however, when ryan trades with ty, ryan gives him his second best pokemon card instead. why was this trade not beneficial for both parties? a) ryan lied about what he was giving to ty. b) ty lied about what he was giving to ryan. c) baseball cards are worth more than pokemon cards. d) pokemon cards are worth more than baseball cards.