In-Group vs. Out-Group Dynamics

Alex is a passionate member of a university's environmental science club, dedicating weekends to local conservation projects with fellow club members. Alex perceives the university's business student association as being primarily focused on corporate profit, a value system that feels fundamentally different from the environmental club's goals. From Alex's perspective, which of the following represents an out-group?

Alex is a passionate member of a local cycling club and spends most weekends on long rides with fellow members. He perceives the local running club, whose members he often sees on the same trails, as being composed of people who are fundamentally different from his own group in their approach to fitness and community. From Alex's perspective, which group best exemplifies an out-group?