What will be the average value of energy for a monoatomic gas in thermal equilibrium at temperature $T$?

For a gas,$\gamma = 7/5$. The gas may probably be

What will be the average value of energy along one degree of freedom for an ideal gas in thermal equilibrium at a temperature $T$? ($k_{B}$ is Boltzmann constant)

Ratio of translational degrees of freedom to rotational degrees of freedom of a polyatomic linear gas molecule is

Which statements are correct about degrees of freedom?
$A.$ $A$ molecule with $n$ degrees of freedom has $n^{2}$ different ways of storing energy.
$B.$ Each degree of freedom is associated with $\frac{1}{2} RT$ average energy per mole.
$C.$ $A$ monoatomic gas molecule has $1$ rotational degree of freedom whereas a diatomic molecule has $2$ rotational degrees of freedom.
$D.$ $CH_{4}$ has a total of $6$ degrees of freedom.
Choose the correct answer from the options given below:

The mean rotational kinetic energy of a diatomic molecule at temperature $T$ is