The correct preposition is "round" because it is commonly used when referring to sitting or gathering around an object, such as a table. This preposition implies that people are positioned in a circular or surrounding manner relative to the table.
Thus, the correct sentence is: "They were all sitting round the table."
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 \(\underline{as\ more\ healthier\ options.} \)