Complete the following sentence by using a suitable question tag given below:-

She is leaving tomorrow, _____?

isn't she?

The correct answer is Option (3) → isn't she?

So, the completed sentence is: "She is leaving tomorrow, isn't she?"

Explanation: The question tag "isn't she?" is used because the main verb in the sentence is "is leaving," which is in the present continuous tense. To form the question tag, we use the auxiliary verb "is" in the negative form "isn't" followed by the pronoun "she" to match the subject of the sentence. This question tag is used to seek confirmation or agreement with the statement.