What is the direction of magnetic field lines inside any magnet?

a.
they travel from north to south.
b.
they travel from south to north.
c.
they travel in a loop.
d.
they travel back and forth within the magnet.
e.
they do not travel through the magnet.

The right option is (C)They travel in a loop.

The magnetic field lines point from the north pole to the south pole. Magnetic lines of force always forms closed loops. However, the magnetic field lines do not just end at the tip of the magnet. It is equally strong at the north pole when compared with the south pole.They go right through it, so that inside the magnet the magnetic field points from the south pole to the north pole.