Which one of the following statement is incorrect?

Options

A. A magnet does not exert a force on a tsationary electrically charged body.
B. Magnet field lines are closed continuous curves and extend from south pole to north pole within the magnet.
C. The tangent to the magnetic field line at any point gives the direction of the magnetic field at that point.
D. Magnetic fields line are widely separated where the magnetic field is strong.