This question does not provide any specific information or context, so it is difficult to determine the correct answer without additional details. However, based on the given options (a, b, c, d), option 'B' is stated as the correct answer.

To provide a detailed explanation, let's analyze each option and discuss why option 'B' might be the correct answer:

a) This option does not provide any information or context, so it is not possible to determine if it is the correct answer or not.

b) This option is stated as the correct answer. Without additional details, it is unclear why this option is correct.

c) This option does not provide any information or context, so it is not possible to determine if it is the correct answer or not.

d) This option does not provide any information or context, so it is not possible to determine if it is the correct answer or not.

Given that option 'B' is the only one stated as the correct answer, it is possible that there is a specific reason for choosing this option. However, without further information, it is impossible to confirm the reasoning behind the correct answer.

In conclusion, without additional details, it is difficult to explain why option 'B' is the correct answer. It is important to provide more context or information in order to accurately determine the correct answer.