The correct option here is "both", as it refers to two or more individuals and indicates that they have been involved together.
Thus, the correct sentence is: "Both employees have been closely associated with the organisation for some time."
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 \(\underline{as\ more\ healthier\ options.} \)