正解:A
To prevent traffic from the Finance VLAN from traversing SwitchC, the appropriate command would be to remove the VLAN associated with Finance from the allowed list on the trunk link connecting SwitchC to the Core switch. This can be achieved by using the switchport trunk allowed vlan remove command followed by the VLAN number. This command modifies the list of VLANs allowed on a trunk interface, effectively preventing any traffic from the specified VLAN from passing through the trunk.