The correct preposition here is "on," because when describing the position of a door relative to a person, it is most natural to say "the door closed on him."
Thus, the correct preposition is "on," making the sentence: "The door closed on him."
Each question has a sentence that has an underlined part. Choose the option which rephrases the underlined part in the most appropriate manner in terms of grammar and usage.
In an attempt to boost their profits, many edible oil-producing companies have been engaging themselves in propaganda against commonly used oils and promoting exotic and expensive varieties of oils \(\underline{as\ more\ healthier\ options.} \)