Answer: In-group
Explanation: In-group could be viewed as a social group in which Individual's which make up the group are share a similar or common interest. In-group members possess a reasonable level of loyalty, respect, solidarity and enthusiasm towards their shared or common interest.
In the scenario above Jim and other New York Yankees fans are in-groups as they share similar or common interest imtoward thame New York Yankees team. Showing feelings of interest, enthusiasm and solidarity toward the team.