The average kinetic energy of an ideal gas per molecule in SI units at $25^{\large\circ}C$ will be

Question

$(a)\;6.2\times10^{-21}KJ\qquad(b)\;6.2\times10^{-21}J\qquad(c)\;6.2\times10^{20}J\qquad(d)\;6.2\times10^{20}KJ$