Glucose synthesis occurs during which stage of `C_(3)` cycle?

Options

A. Carboxylation
B. Oxygenation
C. Reduction
D. regeneration.

Explanation

### Step-by-Step Solution:

1. **Understanding the C3 Cycle**: The C3 cycle, also known as the Calvin cycle, is a crucial process in photosynthesis that occurs in higher plants. It consists of three main stages: carboxylation, reduction, and regeneration.

2. **Identifying the Stages**:
- **Carboxylation**: This is the first stage where carbon dioxide is fixed. The enzyme Rubisco plays a key role in this process by combining carbon dioxide with ribulose bisphosphate (RuBP) to form 3-phosphoglycerate (3-PGA).
- **Reduction**: In this second stage, the 3-PGA molecules are converted into glyceraldehyde-3-phosphate (G3P) using ATP and NADPH produced in the light-dependent reactions of photosynthesis. This is where glucose synthesis occurs.
- **Regeneration**: The third stage involves the regeneration of RuBP from G3P, allowing the cycle to continue.

3. **Conclusion**: Glucose synthesis occurs during the **reduction** stage of the C3 cycle.

### Final Answer:
Glucose synthesis occurs during the **reduction** stage of the C3 cycle.

---