The given question belongs to the Class 6 category. Let's analyze the options and find out why option 'B' is the correct answer.

a)
b)
c)
d)

To determine the correct answer, we need to understand the question and evaluate each option.

Since no specific question is mentioned, we can assume that this is a multiple-choice question where one of the given options is the correct answer.

Looking at the options provided, we can see that option 'B' is the only one that is highlighted as the correct answer. Therefore, we need to analyze why option 'B' is correct.

Based on the information provided, we can conclude that option 'B' is the correct answer because it is the only option that is marked as correct. However, without any additional context or information, it is difficult to determine the precise reason behind this choice.

In summary, based on the given information, option 'B' is the correct answer. However, without further context or details, it is not possible to explain the reasoning behind this choice.