VSI consists of i) capsule which is directly connected to the static port and ii) case which is fed with delayed static pressure caused by the metering unit.
Referring to option D)
As VSI measures
rate of change of static pressure, if the airspeed is changed and it causes a change in static pressure, the same 'changed' pressure will be fed to the case and the capsule so there will be NO DIFFERENTIAL PRESSURE to cause an error in indication.
When the aircraft is close to the ground, due to ground effect there is slight increase in local static pressure which causes errors during take off and landing.
So B) is the best option.
