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.

प्र:

He is writing a letter.

• 1
  A letter is being written by him.
• 2
  A letter is written by him.
• 3
  A letter has been written by him.
• 4
  Let a letter be written by him.