The phrase "500 dollars a month" refers to a specific amount of money. When referring to amounts, prices, or quantities, we do not use an article before the number.
"I live on 500 dollars a month."
Thus, the correct answer is (D) No article required.
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 \(\underline{as\ more\ healthier\ options.} \)