This question belongs to the UPSC category and requires an explanation of why option D is the correct answer. Here's a detailed explanation:

Explanation:
The question does not provide any specific information or context, so we will need to analyze the given options to determine the correct answer.

a) - No information is provided about option A, so we cannot determine if it is the correct answer.

b) - No information is provided about option B, so we cannot determine if it is the correct answer.

c) - No information is provided about option C, so we cannot determine if it is the correct answer.

d) - According to the question, the correct answer is option D. However, since no information or explanation is given, we cannot fully understand why option D is correct.

Given the lack of information, it is not possible to provide a detailed explanation for why option D is the correct answer. To provide a more accurate response, it is necessary to have additional information or context regarding the question.