Answer: B. Field lines loop around the magnet starting at the north pole and ending at the south pole.
Explanation:
A magnet has two poles: North pole and South pole. Magnetic field lines are imaginary lines where magnetic force is exerted. Magnetic field lines form closed loops around the magnet. These lines start from North pole and terminate at south pole. The strength of the magnet is maximum near the poles. The lines are unique and do not cross each other.