There are four light-weight-rod samples A,B,C,D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted (i) A is feebly repelled (ii)B is feebly attracted (iii)C is strongly attracted (iv)D remains unaffected Which one of the following is true ? (a) B is of a paramagnetic material (b) C is of a diamagnetic material (c) D is of a ferromagnetic material (d) A is of a non-magnetic material