Explanation:

The correct answer for this question is option 'C'. Let's break down the question and the options to understand why option 'C' is the correct answer.

Question:
?a) b) c) d) Correct answer is option 'C'. Can you explain this answer? Explain in detail.

Analysis:
The question is asking for an explanation of why option 'C' is the correct answer. To do this, we need to evaluate each of the options and determine which one is the most suitable answer.

Options:
a)
b)
c)
d)

Explanation of Options:
a) No explanation is provided for option 'a'.
b) No explanation is provided for option 'b'.
c) No explanation is provided for option 'c'.
d) No explanation is provided for option 'd'.

Conclusion:
Since no explanations are provided for any of the options, it is not possible to determine why option 'C' is the correct answer. Without any additional information or context, it is impossible to provide a detailed answer explaining why option 'C' is the correct choice.

Therefore, the question remains unanswered as there is not enough information given to justify why option 'C' is the correct answer.