The question is asking for the correct answer option among the provided choices: a), b), c), d). The correct answer is option 'B', but without any context or information about the question itself, it is difficult to provide a detailed explanation.

However, based on the given options, we can assume that the question might be asking for a multiple-choice question where 'B' is the correct answer. To provide a more comprehensive response, let's analyze the possible options and why 'B' is the correct answer.

Possible Options:
a) No information is provided about this option, so we cannot determine its correctness without more details.
b) This option is stated as the correct answer.
c) No information is provided about this option, so we cannot determine its correctness without more details.
d) No information is provided about this option, so we cannot determine its correctness without more details.

Explanation of the Correct Answer (Option 'B'):
Without the specific question, we can only guess the reasoning behind the correct answer. However, based on the given options, we can assume that option 'B' is the correct answer because it is explicitly stated as the correct option.

In a multiple-choice question, the correct answer is typically indicated by the letter corresponding to it. In this case, 'B' is stated as the correct option. It is important to carefully read and understand the question before selecting an answer.

Conclusion:
In conclusion, the question asks for the correct answer among the provided options (a, b, c, d). Without more context or information about the question itself, it is difficult to provide a detailed explanation. However, based on the given options, the correct answer appears to be option 'B' because it is explicitly stated as the correct option. Always make sure to carefully read and understand the question before selecting an answer.