Which of the following statements are true about the magnetic susceptibility ${\chi _m}$ of a paramagnetic substance?

In a permanent magnet at room temperature,

The magnetic susceptibility of a paramagnetic substance at $-173^{\circ} C$ is $1.5 \times 10^{-2}$. To have the susceptibility $0.5 \times 10^{-2}$,the change in temperature in ${ }^{\circ} C$ is

Given below are two statements:
Statement $I:$ For a diamagnetic substance $-1 \leq \chi < 0$,where $\chi$ is the magnetic susceptibility.
Statement $II:$ Diamagnetic substances,when placed in an external non-uniform magnetic field,tend to move from the stronger to the weaker part of the field.
In the light of the above statements,choose the correct answer from the options given below.

Which of the following materials exhibits diamagnetism?

For two types of magnetic materials $A$ and $B$, the variation of $\frac{1}{\chi}$ ($\chi$: magnetic susceptibility) versus temperature $T$ is shown in the figure. Then: