Use a question tag to confirm the statement:
You need a pen. Perhaps Jane has got one. Ask her Jane, you haven't got a pen, ____________.
A) don't you?
B) haven't you?
C) do you?
D) have you?

Hint: In the given question, the statement is negative. Therefore, using the concept of question tags the given blank should be positive and with this the sentence would become complete.

Complete answer:
In the given question, we have been given a blank and we need to fill it with the most suitable option from the four given options.
In order to find the correct answer, it is necessary that we understand the concept of question tags. A question tag is used to turn a statement into a question, using the modal auxiliary verb and the subject pronoun. If a statement is negative and the question tag is positive and vice-versa.
In the given question, the statement is negative with the auxiliary verb being ‘haven’t or ‘have not’ and the subject is ‘Jane’, to whom the speaker is talking directly. Hence, the question tag that needs to be formed should be ‘have + you’.
Let us take a look at the given options and look for a similar option.
The correct answer is option ‘D’, ‘have you’ as it follows the given rules of following a question tag accurately.
Options ‘A’ and ‘B’ are incorrect as they are negative question tags and are hence, incorrect for the sentence. Option ‘C’ is incorrect as it does not follow the given auxiliary verb.

Note:
To answer such questions easily, understand the concept of question tags as well as the types of sentences well. Once this is clear, its usage will come naturally to you.