The Theorem of Equipartition of Energy States That the Energy $\frac { 1 } { 2 } m v ^ { 2 }$

The theorem of equipartition of energy states that the energy each degree of freedom contributes to each molecule in the system (an ideal gas) is

A) $\frac { 1 } { 2 } m v ^ { 2 }$ .
B) $\frac { 1 } { 3 } k _ { B } T$ .
C) $\frac { 1 } { 2 } k _ { B } T$ .
D) $\frac { 3 } { 2 } m v ^ { 2 }$ .
E) $\frac { 3 } { 2 } k _ { B } T$ .