There is no specific question mentioned in the given prompt, but it seems to be related to multiple-choice options and selecting the correct answer. The prompt states that the correct answer is option 'C', and we are asked to explain why this option is correct.

To provide a detailed explanation, we will break down the answer into different sections:

Option C:
- This option is the correct answer according to the given prompt.

Options A, B, and D:
- These options are not the correct answers.

Reasoning behind the Correct Answer:
- Unfortunately, the prompt does not provide any information about the reasoning behind the correct answer. Without further context or details, it is difficult to explain why option C is correct.

Class 8 Category:
- The prompt mentions that this question belongs to the Class 8 category. This suggests that the question is designed for students in the 8th grade level. It is important to note that the specific subject or topic related to this question is not mentioned.

Conclusion:
- In conclusion, the prompt provides limited information about the question and the correct answer. It only mentions that option C is the correct answer and that the question belongs to the Class 8 category. Without further context or details, it is challenging to provide a comprehensive explanation for the correct answer.