Correct option is B
PMMC (Permanent Magnet Moving Coil) instruments have a linear scale, meaning the deflection is directly proportional to the current passing through them.
This device can be used only in DC. In this device the deflection torque is directly propertional to the current.
with spring control,
In the final deflected position,
Hence the deflection is directly proportional to the current, Hence the scale will be uniform.
