Choose the correct passive form of the sentence : I have written a letter.

A A letter is being written by me .

B A letter has being written by me

C A letter has been written by me

D A letter was being written by me

Correct Answer: Option C

Active: Subject + have/has/had + V3 + Object
Passive: Object টি Subject হয় + have/has/had + been + V3 +by + Subject টি Object হয়।