Choose the sentence that uses the correct question tag:

The correct answer is Option (1) → You are going out, aren't you?

Question tags:

• Rule: a positive statement takes a negative tag, and a negative statement takes a positive tag.
• The tag is made of:
  • the helping verb of the statement;
  • a pronoun for the subject.
• It is joined to the statement by a comma and ends with a question mark.
• This sentence: "You are going out" is positive, with the helping verb are, so the tag is aren't you?
  Example: She is your sister, isn't she?

Why the Other Options are Incorrect?

Option 2: Rajeev will be staying at home. Is he? — Incorrect.

• The statement is positive, so the tag must be negative and use the helping verb will: "won't he?"
• The tag is joined by a comma, not written as a separate sentence.
  Corrected: Rajeev will be staying at home, won't he?

Option 3: Meena will not be going. won't she? — Incorrect. The statement is negative, so the tag must be positive: will she?
Corrected: Meena will not be going, will she?

Option 4: They are interested to join us, are they? — Incorrect.

• The statement is positive, so the tag must be negative: "aren't they?"
• "Interested" takes "in joining", not "to join".
  Corrected: They are interested in joining us, aren't they?