Helium atom is two times heavier than hydrogen molecule at $298\;K$ , the average kinetic energy of helium is ______

Question

$\begin{array}{1 1} \text{(a)two times that of a hydrogen molecule} \\ \text{(b) Same as that of hydrogen molecule} \\ \text{(c) four times that of a hydrogen molecule} \\ \text{ (d) half that of a hydrogen molecule} \end{array}$