Choose the sentence that uses the correct question tag:

The correct answer is Option (4) → This narrow lane is unsafe after dark, isn’t it?

Question tag after a word with “un-”:

A word like “unsafe” has a negative meaning, but it does not make the sentence negative. Words like “not”, “never” or “hardly” do that. So the sentence is positive and takes the negative tag “isn’t it”.

Why the Other Options are Incorrect?

Option 1: Anil hardly sleeps before midnight, doesn’t he? — Incorrect. The given sentence has “hardly”, which means almost not. It makes the sentence negative, so the tag must be positive.
Corrected: Anil hardly sleeps before midnight, does he?

Option 2: The tailors have finished the school uniforms, didn’t they? — Incorrect. The helping verb in the sentence is “have”. The tag must repeat “have”, not use “did”.
Corrected: The tailors have finished the school uniforms, haven’t they?

Option 3: The head boy will read the pledge in the assembly, won’t she? — Incorrect. The tag uses the pronoun for the subject. The head boy is a boy, so the pronoun is “he”.
Corrected: The head boy will read the pledge in the assembly, won’t he?