On the RMI, the pointer arrow head (reference to VOR) represents
a- QDM
b- QDR
c- Radial inbound
A - QDM, the Magnetic Direction of the station, measured at the aircraft (i.e. with the magnetic variation at the aircraft.) This is not the correct answer, as the RMI needle presentation is set to "VOR". A VOR produces two phased radio signals, with the phase difference defining the magnetic radial at the VOR. This is the difference between using a needle presentation for a VOR, and using an ADF needle (which is the point of asking this particular question).
B - QDR - the Magnetic bearing from a station. The pointer arrow TAIL would read the bearing from the station. The arrow head is displaying:
C- the radial (as determined by the VOR's signal phase difference, referenced to magnetic north at the VOR station), inbound as you are using the head of the needle. Not good terminology, but the closest correct answer.