Pick out the statement which is not true :

Options

A. Measurements with the tangent galvanometer will be more accurate when the deflection is around `45^@`
B. While taking readings with a tangent galvanometer, the readings are repeated by reversing the current to take care of the fact that the plane of the coil may not be exactly along the earth’s magnetic meridian.
C. A tangent galvanometer cannot be used in the polar region
D. A short magnet is used in a may not easily move. tangent galvanometer since a long magnet would be heavy and may not easily move.