For the fixation of $1$ molecule of $CO_2$ in the Calvin cycle,how many molecules of $NADPH$ and $ATP$ are required?
- A$6$ $NADPH$ and $3$ $ATP$
- B$2$ $NADPH$ and $3$ $ATP$
- C$12$ $NADPH$ and $18$ $ATP$
- D$5$ $NADPH$ and $3$ $ATP$
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