Natural sink of stratospheric ozone layer is :

Options

A. Sulphuric dioxide
B. Sulphur fluxes of oceans
C. freons
D. HCFCs.

Answer

To answer the question regarding the natural sink of the stratospheric ozone layer, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking for the natural sink of the stratospheric ozone layer. A "sink" refers to a process or substance that removes or depletes a particular component from the environment.

2. **Identify the Options**: The options provided are:
- A) Sulfuric dioxide
- B) Sulfur fluxes of oceans
- C) Freons
- D) HCFCs (Hydrochlorofluorocarbons)

3. **Analyze Each Option**:
- **A) Sulfuric Dioxide**: This compound is not primarily known for its role in ozone depletion in the stratosphere.
- **B) Sulfur Fluxes of Oceans**: While sulfur compounds can influence atmospheric chemistry, they are not a direct sink for stratospheric ozone.
- **C) Freons**: These are chlorofluorocarbons (CFCs) that contribute to ozone depletion but are not considered a natural sink.
- **D) HCFCs**: These are also halocarbons that lead to ozone depletion by releasing chlorine in the stratosphere, which reacts with ozone (O3).

4. **Determine the Correct Answer**: Based on the analysis, the correct answer is **D) HCFCs**. Although HCFCs are man-made, they act as a sink for ozone in the stratosphere by contributing to its depletion.

5. **Conclusion**: The natural sink of the stratospheric ozone layer is primarily influenced by substances like HCFCs, which release halogens that react with ozone, leading to its degradation.