Choose the sentence in the active voice:

The correct answer is Option (3) → The milk boiled over while Amma was talking on the phone.

Active voice:

Here the milk itself boiled over. The verb “boiled over” has no object, and there is no be + past participle (V3). So the sentence is active. The milk did nothing on purpose, but that does not make the sentence passive. The verb form decides the voice. “Was talking” is also active, because Amma does the talking.

Why the Other Options are Incorrect?

Option 1: The old wooden bridge was washed away by the flood last August. — Incorrect. “Was washed away” is was + V3 and the bridge receives the action of the flood, so this is passive.

Option 2: The guests were welcomed with garlands at the gate. — Incorrect. “Were welcomed” is were + V3 and the guests receive the action, so this is passive. No doer is named, but the voice is still passive.

Option 4: Ravi’s lost wallet was returned by a rickshaw driver. — Incorrect. “Was returned” is was + V3 and the wallet receives the action, so this is passive.