Correct option is B
Explanation of the Correct Answer: · The given sentence is in active voice (past simple tense).
· The passive structure for past simple is:
· Active: "Mr. Suman opened the door."
· Passive: "The door was opened by Mr. Suman."
Why Are the Other Options Incorrect? · (a) "The door was being opened by Mr. Suman." → Incorrect; changes the tense to past continuous.
· (c) "The door is opened by Mr. Suman." → Incorrect; changes the tense to present simple.
· (d) "The door is being opened by Mr. Suman." → Incorrect; changes the tense to present continuous.
Thus, the correct passive voice sentence is:
"The door was opened by Mr. Suman."