Magnets cannot be made from which of the following substances?

Consider the following two statements $A$ and $B$ and identify the correct choice in the given answers.
$A$. Paramagnetism is explained by domain theory.
$B$. Susceptibility of a diamagnetic substance is independent of temperature.

The relative permeability is represented by $\mu_r$ and the susceptibility is denoted by $\chi$ for a magnetic substance. Then for a paramagnetic substance:

An example of a diamagnetic substance is

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature,then it will show

In a permanent magnet at room temperature,