A balloon has 5.0g mole of helium at $7^{\large\circ}C$.Calculate the total internal energy of the system

Question

$\begin{array}{1 1}(A)\;3.48\times 10^4J\\(B)\;1.74\times 10^4J\\(C)\;3.48\times 10^6J\\(D)\;3.48\times 10^5J\end{array}$