Every $CO_{2}$ molecule entering the Calvin cycle needs:

  • A
    $2$ molecules of $NADPH$ and $3$ molecules of $ATP$ for its fixation.
  • B
    $2$ molecules of $NADPH$ and $2$ molecules of $ATP$ for its fixation.
  • C
    Variable amount of $ATP$.
  • D
    Only $NADPH$.

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