What is a hard ferromagnetic substance?

Which of the following statements are correct?
$(A)$ Electric monopoles do not exist whereas magnetic monopoles exist.
$(B)$ Magnetic field lines due to a solenoid at its ends and outside cannot be completely straight and confined.
$(C)$ Magnetic field lines are completely confined within a toroid.
$(D)$ Magnetic field lines inside a bar magnet are not parallel.
$(E)$ $\chi = -1$ is the condition for a perfect diamagnetic material,where $\chi$ is its magnetic susceptibility.
Choose the correct answer from the options given below:

At Curie point,a ferromagnetic material becomes

The magnetic susceptibility of a paramagnetic material is $1.0 \times 10^{-5}$ at $27^{\circ} C$ temperature. Then at what temperature its magnetic susceptibility would be $1.5 \times 10^{-5}$ (in $^{\circ} C$)?

When a ferromagnetic material is heated to a temperature above its Curie temperature,the material

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: