Correct option is A
Explanation of the Correct Answer: · In passive voice: "The letter had been posted by me before I met him."
· The active voice structure follows:
· "Had been posted" (past perfect passive) → "Had posted" (past perfect active).
· "By me" is replaced with "I" as the subject.
· The correct active voice form is: "I had posted the letter before I met him."
Why Are the Other Options Incorrect? · (b) "After meeting him" → Incorrect; changes the sequence of events.
· (c) "Has been posted" → Incorrect tense usage; should be "had been posted."
· (d) "I met him after posting the letter" → Incorrect structure.
Thus, the correct answer is (a) I had posted the letter before I met him.