During light reaction in photosynthesis the following are formed.

Options

A. ATP and sugar
B. hydrogen, `O_(2)` and sugar
C. ATP, hydrogen donor and `O_(2)`
D. ATP, hydrogen and `O_(2)` donor

Explanation

### Step-by-Step Solution:

1. **Understanding Light Reactions**:
- Light reactions of photosynthesis occur in the thylakoid membranes of chloroplasts.
- They require light energy to initiate the process.

2. **Photolysis of Water**:
- During light reactions, water (H2O) is split into oxygen (O2), protons (H+), and electrons (e-). This process is known as photolysis.
- The equation for photolysis can be summarized as:
\[ 2H_2O \rightarrow 4H^+ + 4e^- + O_2 \]

3. **Formation of ATP and NADPH**:
- The absorbed light energy is used to drive electrons through a series of proteins (electron transport chain) which helps in creating a proton gradient.
- This proton gradient is utilized by ATP synthase to convert ADP and inorganic phosphate (Pi) into ATP.
- Additionally, the electrons reduce NADP+ to form NADPH.

4. **Products of Light Reactions**:
- The main products of the light reactions are:
- ATP (adenosine triphosphate)
- NADPH (nicotinamide adenine dinucleotide phosphate)
- Oxygen (O2) is released as a byproduct.

5. **Identifying the Correct Option**:
- From the options provided, the correct answer is:
- **ATP, hydrogen (as protons), and oxygen**.

### Final Answer:
The correct answer is **ATP, hydrogen (as protons), and oxygen**.

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