Explanation:

To explain why option 'C' is the correct answer, we need to analyze the given information and compare it with the options provided.

Given Information:
- The question belongs to the Class 9 category, which indicates that the answer should be related to the syllabus or content taught in Class 9.
- The options provided are labeled as 'a', 'b', 'c', and 'd'.

Analysis:
Based on the given information, we can assume that the question is asking for a correct answer related to the Class 9 syllabus. To determine the correct option, we need to examine each option and its relevance to the syllabus.

Option 'A':
There is no specific information provided about option 'A', so it cannot be determined whether it is correct or not.

Option 'B':
There is no specific information provided about option 'B', so it cannot be determined whether it is correct or not.

Option 'C':
According to the question, the correct answer is option 'C'. However, without further context or additional information, it is difficult to determine the exact reason why option 'C' is correct.

Option 'D':
There is no specific information provided about option 'D', so it cannot be determined whether it is correct or not.

Conclusion:
Based on the given information and analysis of the options, it is difficult to provide a detailed explanation for why option 'C' is the correct answer. Without additional context or information about the question, it is challenging to determine the reasoning behind the correct answer. It is recommended to provide more specific details or context for a more accurate explanation.