To answer this question, we need to understand the given options and determine which one is correct. Let's analyze each option and see why option 'A' is the correct answer.

a) Option 'A'

b) Option 'B'

c) Option 'C'

d) Option 'D'

Now let's explain why option 'A' is the correct answer.

Explanation:

- Option 'A' is the correct answer because it is the only option that is specified as the correct answer.
- The other options, 'B', 'C', and 'D', do not provide any information or context to determine their correctness.
- Without any additional information or context, we can only assume that the correct answer is option 'A' based on the given question.

Conclusion:

In conclusion, the correct answer to the question is option 'A'. This is because it is the only option specified as the correct answer. The other options do not provide any information or context to determine their correctness. Therefore, option 'A' is the most logical and appropriate choice based on the given question.