The correct answer is D. Preface.
A preface is an introductory statement or essay that precedes the main text of a book or other literary work. It is typically written by the author or editor of the work, and it may provide background information on the work, its purpose, or its intended audience.
A proclamation is a formal announcement or declaration, especially one made by a public figure. It is often used to announce a new law or policy, or to call for action on a particular issue.
A narrative is a story or account of events, told in a chronological order. It may be fictional or non-fictional, and it may be told in a variety of ways, such as through writing, speech, or film.
A conclusion is the final part of a piece of writing or speech, in which the main points are summarized and the author’s or speaker’s main argument is restated.
In the context of the question, the word “proem” is most closely synonymous with the word “preface.” A proem is an introductory statement or essay that precedes the main text of a book or other literary work, just like a preface. A proclamation, narrative, and conclusion are all different types of texts, and they do not share the same meaning as a proem.