In the following question, a sentence has been given in Active/Passive voice. Out of four alternatives suggested, select the one which best expresses the same sentence in Passive/Active voice.
The seawater eventually corroded the pillars of the bridge.

1. A
   Eventually the pillars of the bridge are being corroded by the seawater.
2. B
   Eventually the pillars of the bridge have been corroded by the seawater.
3. C
   The pillars of the bridge were eventually corroded by the seawater.
4. D
   The pillars of the bridge have been eventually corroded by the seawater.