In the nuclear fusion reaction, 
given that the repulsive potential energy between the two nuclei is ~ 7.7 × 1014J, the temperature at which the gases must be heated to initiate the reaction is nearly [Boltzmann's constant k = 1.38 × 10–23J/K]
(a) 107K
(b) 105K
(c) 103K
(d) 109K.
