There are four lightweight rod samples $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$ separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted:

(i) $\mathrm{A}$ is feebly repelled
(ii) $\mathrm{B}$ is feebly attracted
(iii) $\mathrm{C}$ is strongly attracted
(iv) $\mathrm{D}$ remains unaffected

Which one of the following is true?