The energy released by the fission of one uranium atom is $200 \text{ MeV}$. The number of fissions per second required to produce $6.4 \text{ W}$ power is $\qquad$ .
- A$10^{11}$
- B$2 \times 10^{11}$
- C$10^{10}$
- D$2 \times 10^{10}$
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