The correct option is B <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
Inside a magnet, magnetic field lines moves from north to south pole.
Characteristics of magnetic field and field lines are:
1. Magnetic field lines form closed loops.
2. Outside the magnet they move from north pole to south pole and inside the magnet they move from south pole to north pole.
3. No two magnetic field lines intersect each other.