Kinetic energy of molecules is highest in

Which among the following statements is correct?
$A$. There is a complete order of molecules in gases.
$B$. There is a complete disorder of molecules in gases.
$C$. Molecules are not always in random motion in gases.
$D$. Molecules are fixed at respective position in gases.

According to the Kinetic Molecular Theory of Gases,which of the following statements is correct?

If $N_2, O_2, H_2$,and $He$ are filled separately in four car tubes at the same pressure,which gas will fill first?

At what temperature will the total kinetic energy of $0.30 \ mol$ of $He$ be the same as the total kinetic energy of $0.40 \ mol$ of $Ar$ at $400 \ K$ (in $K$)?

According to the kinetic theory of gases,