Choose the best answer:
Are your uncle and aunt still here?
A) Yes, they are.
B) They are fine.
C) It’s OK. Thanks.
D) We have a nice family.

Hint: The options must be studied keenly. We need the answer that is in a conversational style and also satisfies the demand of the question asked by the first person. The answer should mention the availability or presence of uncle and aunt.

Complete answer:
Let us analyze each option one by one.
Option A is yes they are. This option is the correct answer as this reply is the most suitable answer in the case and it also follows the hint. Therefore, option A is correct.
Option B is they are fine. This option means that they are good. But this is not asked how are they. The answer is incorrect and the reply is not suitable for this question.
Option C is It's OK. Thanks. This option is also not suitable for the question. As the speaker is asking that the uncle and aunt are still here. Therefore, the option is not correct.
Option D is we have a nice family means my family is nice and lovely. This is also similar to option C that the reply is not suitable at all. Therefore, the sentence is not correct.

Note: In a conversation between two persons, the reply by the second person is in line with the statement given by the first person. As in this case if the first person asks a question then the reply will be in line with it.