Correct option: A.magnetic susceptibility is inversely proportional to the absolute temperature
a
Curie's Law$:$
In a paramagnetic material the magnetization of the material is directly proportional to an applied magnetic field. However, if the material is heated, the magnetization is inversely proportional to temperature. i.e. $\mathrm{M}=\mathrm{C} \times(\mathrm{B} / \mathrm{T})$
where,
$M$ is the magnetisation
$B$ is the magnetic field, measured in teslas
$T$ is absolute temperature, measured in kelvins
$C$ is a material-specific Curie constant
It was first discovered experimentally by French physicist, Pierre Curie. It holds for high temperatures, or weak magnetic fields.