This question does not provide any context or information, so it is difficult to determine what the options (a, b, c, d) refer to. However, the correct answer is given as option 'B'.

To provide a detailed explanation, let's analyze the options:

a) -
b) -
c)
d)

Since there is no information provided for options a, c, and d, it is not possible to determine if any of them are correct. As a result, we can only focus on option 'B' as the correct answer.

Explanation for option 'B':
Unfortunately, without any context or information about option 'B', it is impossible to provide a detailed explanation for why it is the correct answer. It could be related to a specific topic or subject, but without further details, it is difficult to make any assumptions.

In conclusion, based on the given information, option 'B' is the correct answer. However, without any context or explanation for the options, it is challenging to provide a thorough analysis. It is important to provide more details or clarify the question in order to provide a more accurate and comprehensive answer.