Assertion: Light-harvesting complexes (LHC) on thylkoid membrane broaden the range of light absorption:
Reason: They transfer electrons to reaction center.

Options

A. If both Assertion and Reason are true and the Reason is the correct explanation
B. If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.
C. If Assertion is true, but Reason is false.
D. If both Assertion and Reason are false.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that light-harvesting complexes (LHC) on the thylakoid membrane broaden the range of light absorption. This means that LHCs are responsible for capturing a wider spectrum of light wavelengths, which is essential for photosynthesis.

2. **Understanding the Reason**: The reason provided is that these complexes transfer electrons to the reaction center. This implies that the primary function of LHCs is to transfer electrons, which is not entirely accurate.

3. **Role of Light-Harvesting Complexes**: Light-harvesting complexes, also known as antenna complexes, consist of proteins and pigments (like chlorophyll and carotenoids) that absorb light energy. They capture light energy and funnel it to the reaction centers of photosystems, where the actual conversion of light energy to chemical energy occurs.

4. **Absorption Spectrum of Pigments**: The pigments in LHCs have non-overlapping absorption spectra, which allows them to capture light from different parts of the spectrum. This characteristic is what enables LHCs to broaden the range of light absorption for photosynthesis.

5. **Clarifying the Reason**: The reason states that LHCs transfer electrons to the reaction center. However, this is misleading. Instead of transferring electrons, LHCs transfer the absorbed light energy to the reaction center, where the light energy is converted into chemical energy.

6. **Conclusion**: Based on the analysis, the assertion is true because LHCs do broaden the range of light absorption. However, the reason is false because LHCs do not transfer electrons; they transfer light energy to the reaction center.

### Final Answer:
- **Assertion**: True
- **Reason**: False