Select the correct passive form of the given sentence.
Gulliver easily pulled all the warships of the enemy after him.

A

All the warships of the enemy had been easily pulled by Gulliver after him.

B

All the warships of the enemy were easily pulled by Gulliver after him.

C

All the warships of the enemy were being easily pulled by Gulliver after him.

D

All the warships of Gulliver were easily pulled by the enemy after him.