The Average Molecular Translational Kinetic Energy of a Molecule in an Ideal

The average molecular translational kinetic energy of a molecule in an ideal gas is:

A) $\frac{3}{2}$ kBT.
B) $\frac{3}{2}$ RT.
C) $\frac{5}{2}$ kBT.
D) $\frac{5}{2}$ RT.
E) $\frac{n+3}{2}$ kBT, where n = number of internal degrees of freedom.