As the temperature is raised from $20^{\circ} C$ to $40^{\circ}$ the average kinetic energy of neon atoms changes by a factor equal to ?

Question

$\begin{array}{1 1}(A)\;\frac{1}{2} \\(B)\;2 \\(C)\;\frac{313}{293} \\ (D)\;\sqrt { \large\frac{313}{293}} \end{array}$