Select the alternative that will improve the highlighted part of the sentence in case there is no improvement select “No improvement”.
You have my mobile number, isn’t it?

Correct option is A

Option (a) don’t you is the correct improvement for the highlighted part of the sentence.
• The original sentence "You have my mobile number, isn’t it?" uses "isn't it" incorrectly as a tag question for a statement with "have".
• The corrected tag "don’t you" aligns with the use of "have" in the main sentence, properly forming a tag question that inverts the auxiliary verb "do" and the subject "you".
• This tag question format is used to confirm the truth of the statement made in the main part of the sentence.
• Example: You know the answer, don’t you?