Which one is correct?

Correct Answer: (C) There is no room for doubt in it. Idiomatic expression and correct word choice is a key area in NTRCA English exams. Explanation: "There is no room for doubt" is the correct idiomatic expression in English. Why "room" is used here: — "Room" can mean both a physical room AND an available space/opportunity — "No room for doubt" = no space/possibility for doubt to exist — This is a fixed idiomatic phrase in English Examples of "room" used idiomatically: — "There is no room for error." — "Is there room for improvement?" — "There is no room for compromise." Why others are wrong: ✗ "No place for doubt" — "place" is not used this way idiomatically in English ✗ "No space for doubt" — "space" implies physical area; not used in this context ✗ "No area to doubt" — grammatically incorrect and not idiomatic Other Collocations to Remember: — "No room for doubt/error/improvement/maneuver" — "Make room for" = create space/opportunity for something Source: Oxford Learner's Dictionary; English Idioms; NTRCA Question Bank.