One day the old sailor was watching the water snakes swimming round the ship. ( passive)

• ক One day the water snakes were being watched swimming round the ship by the old sailor. ✅ সঠিক উত্তর
• খ One day the water snakes being watched swimming round the ship.
• গ One day the water snakes is being watched swimming round the ship by the old sailor.
• ঘ One day the water snakes were watched swimming round the ship by the old sailor.