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Dear student,

For reduction of one molecule of CO₂ , we need 3 ATP and 2NADPH (option 3)
The steps where they are needed are as follows -

During Reduction 

• Here, 2 molecules each of ATP and NADPH are required for fixing 1 molecule of CO₂.
• This stage contains a series of reactions.
• Glucose is formed as a result of this series of reactions.

During Regeneration

• RuBP regenerates to enable the cycle to continue uninterrupted.
• 1 ATP molecule is required.