Sainik School Entrance Exam 2021 Solved Paper

(b) The correct passive form of the given sentence is, The fire has been lit by someone.
It is the right option as the subject of the given sentence (somebody) comes in the spot of the object (the fire) and the other way around, a similar tense is utilized (present perfect tense), and 'been' is utilized with the past participle of the main action word (lit).