Which of the following articles is used as a direct article?

The choice "the" serves as the correct answer because it is recognized as a definite article, which is used to refer to a specific noun that is already known to the reader or listener. For example, in the phrase "the book on the table," "the" indicates that it is a particular book that both the speaker and the listener are aware of.

In contrast, "a" and "an" are indefinite articles, used to refer to non-specific nouns. For instance, "a car" means any car, not a specific one. "Some" is a determiner that indicates an unspecified quantity but does not function as a direct article. Therefore, "the" is the only option that directly refers to a specific entity in a sentence, highlighting its role as a definite article.