Nuclear Fusion Is Achieved by Fusing Hydrogen Isotopes at High

Nuclear fusion is achieved by fusing hydrogen isotopes at high temperatures of the order of 10⁹ K.The average kinetic energy of deuterium,one of the isotopes of hydrogen,at this temperature is

A) 2.07 * 10^-14 J.
B) 4.1 * 10^-14 J.
C) 6.7 * 10^-13 J.
D) 9.8 * 10^-12 J.
E) 11.5 * 10^-12 J.