If,on the Average,each Fission Reaction of ²³⁵U Releases 200 MeV $\times$

Multiple Choice

If,on the average,each fission reaction of ²³⁵U releases 200 MeV of energy,how many nuclei of ²³⁵U fission every second in a 200-MW reactor?

A) 6.3 $\times$ 10¹⁸
B) 6.0 $\times$ 10²³
C) 1.0 $\times$ 10¹⁹
D) 1.6 $\times$ 10¹⁹
E) 2.7 $\times$ 10¹⁸