Choose the sentence that uses the correct question tag:

The correct answer is Option (1) → Don’t throw plastic bags into the river, will you?

Question tag after “Don’t”:

A sentence that begins with “Don’t” tells someone not to do something. It is a negative order, and it takes the tag “will you”.

Why the Other Options are Incorrect?

Option 2: Arun slept through the thunderstorm, wasn’t he? — Incorrect. The given sentence says “slept”. It is in the simple past with no helping verb. So the tag must use “did”, not “was”.
Corrected: Arun slept through the thunderstorm, didn’t he?

Option 3: Priya doesn’t eat onions, doesn’t she? — Incorrect. The sentence has “doesn’t”, so it is negative. A negative sentence takes a positive tag.
Corrected: Priya doesn’t eat onions, does she?

Option 4: The bus drivers are on strike today, aren’t we? — Incorrect. The tag uses the pronoun for the subject. “The bus drivers” becomes “they”, not “we”.
Corrected: The bus drivers are on strike today, aren’t they?