Four atmospheric layers are given below, namely (i) stratosphere (ii) Thermosphere, (iii) mesosphere and (iv) troposphere The lowermost and higher most layers are respectively :

Options

A. i) and (iv)
B. iii) and (i)
C. (iv) and (ii)
D. (iii) and (ii)

Answer

To solve the question regarding the atmospheric layers, we will identify the lowermost and highermost layers among the given options: Stratosphere, Thermosphere, Mesosphere, and Troposphere.

### Step-by-Step Solution:

1. **Identify the Layers**: The four atmospheric layers mentioned are:
- Troposphere
- Stratosphere
- Mesosphere
- Thermosphere

2. **Understand the Order of Layers**: The layers of the atmosphere are arranged in order from the Earth's surface upwards:
- **Troposphere**: This is the lowest layer of the atmosphere, extending from the Earth's surface up to about 12 kilometers.
- **Stratosphere**: This layer is above the troposphere, extending from approximately 12 kilometers to about 50 kilometers.
- **Mesosphere**: Located above the stratosphere, this layer extends from about 50 kilometers to 80 kilometers.
- **Thermosphere**: This is the uppermost layer, extending from about 80 kilometers to 700 kilometers or more.

3. **Determine the Lowermost Layer**: From the information above, the lowermost layer is the **Troposphere**.

4. **Determine the Highermost Layer**: The highermost layer, as per the order of the atmospheric layers, is the **Thermosphere**.

5. **Final Answer**: Therefore, the lowermost layer is Troposphere (1st layer) and the highermost layer is Thermosphere (4th layer).

### Conclusion:
The correct answer is:
- Lowermost layer: Troposphere
- Highermost layer: Thermosphere