Direction: In the following questions, a sentence has been given in Active voice. Out of the four alternatives suggested, select the one which best expresses the same sentence in Passive voice.

Q:

 The telephone had been invented by Graham Bell.

• 1
  Graham Bell should have invented the telephone
• 2
  Graham Bell has invented the telephone
• 3
  Graham Bell had invented the telephone
• 4
  Graham Bell invented the telephone