9. Suppose that the temperature at the center of the Sun is 2.00×107 K, what is the average translational kinetic energy of a protonin the Sun’s center? （kB=1.3810−23 × J/K）
(A) 1.38×10−16J
(B)4.14×10^−16J 
(C) 5.52×10^{−16J 
(D) 7.64×10−16J 
(E) 8.96 ×10−16J}