Topic: Article,

Best Answer Explained in Below-:

The correct choice for the sentence "The book is--one I was looking for" is C) "the." This selection accurately fits the context and grammatical structure of the sentence.

The definite article "the" is used to refer to something specific or known to the speaker and listener. In this case, the phrase implies that both the speaker and listener are familiar with a particular book that has been the subject of discussion or interest. By using "the book," it signals that the speaker is talking about one specific book that meets certain criteria, namely, the one they were searching for.

In contrast, the options "a," "an," and "no article" would be incorrect in this context. "A" and "an" suggest any book rather than a specific one, which conflicts with what the speaker is implying. "No article" would render the phrase incomplete and confusing. Therefore, "the" is the most suitable choice, establishing clarity and specificity in communication.