Final answer:
The general fund is the one that can report a positive unassigned fund balance, as other governmental funds have resources that are constrained for specific purposes.
Step-by-step explanation:
The only fund that can report a positive unassigned fund balance is the general fund. Unassigned fund balance refers to the amount of expendable resources in a governmental fund that has not been constrained to specific purposes by a fund balance commitment or assignment. Governmental funds other than the general fund should not report a positive unassigned fund balance because their resources are already constrained to a specific purpose.