The magnetic field lines produced by a bar magnet :
(a) originate from the south pole and end at its north pole
(b) originate from the north pole and end at its each pole
(c) originate from the north pole and end at its south pole
(d) originate from the south pole and end at its west pole
The magnetic field lines originate from the north pole of a magnet and end at its south pole. So, the correct choice is (c).