The energy released by the fission of one uranium nucleus is $200 \text{ MeV}$. The number of fissions per second required to produce $128 \text{ W}$ power is:

  • A
    $6 \times 10^{12}$
  • B
    $2 \times 10^{12}$
  • C
    $8 \times 10^{12}$
  • D
    $4 \times 10^{12}$

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