Study the following statements and select the correct ones.
(i) Organisms capable to tolerate a wide range of temperature are called stenothermal organisms.
(ii) Thermal tolerance of different species determine their grographical distribution to a large extent
(iii) Avarge temperature in tropical deserts in summer is `lt 50^(@)C`.
(iv) Thermal springs cannot sustain life due to very high average temperature i.e., `gt 100^(@)C`.

Options

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

Explanation

To solve the question, we need to evaluate each statement one by one to determine if they are correct or incorrect.

### Step-by-Step Solution:

1. **Statement (i)**: "Organisms capable to tolerate a wide range of temperature are called stenothermal organisms."
- **Evaluation**: This statement is incorrect. Organisms that can tolerate a wide range of temperatures are called **eurythermal** organisms, not stenothermal. Stenothermal organisms can only tolerate a narrow range of temperatures.
- **Conclusion**: Incorrect.

2. **Statement (ii)**: "Thermal tolerance of different species determines their geographical distribution to a large extent."
- **Evaluation**: This statement is correct. The ability of organisms to tolerate certain temperature ranges affects where they can live. For example, some species thrive in hot environments while others prefer cold climates.
- **Conclusion**: Correct.

3. **Statement (iii)**: "Average temperature in tropical deserts in summer is < 50°C."
- **Evaluation**: This statement is incorrect. The average temperature in tropical deserts during summer typically exceeds 50°C. Therefore, the statement is false.
- **Conclusion**: Incorrect.

4. **Statement (iv)**: "Thermal springs cannot sustain life due to very high average temperature i.e., > 100°C."
- **Evaluation**: This statement is incorrect. Thermal springs can indeed sustain life, particularly extremophiles like certain archaea that thrive in high-temperature environments, even above 100°C.
- **Conclusion**: Incorrect.

### Final Conclusion:
The only correct statement is **(ii)**. Therefore, the answer is that only statement (ii) is correct.