Concept:Paramagnetic substances are feebly attracted by magnets and have a small, positive magnetic susceptibility (χ>0).Explanation:The paramagnetic theory applies to materials that develop weak magnetization in the direction of an external field.Examples include platinum, aluminium, and manganese.Iron and nickel are ferromagnetic — they are strongly attracted and have very large positive susceptibility (χ>1000).Mercury is diamagnetic — it is feebly repelled by magnets and has small negative susceptibility (−1≤χ≤0).Only platinum among the given options exhibits paramagnetic behavior.Answer:Platinum (Option C)