What is a key advantage of a biography?

A biography is a detailed account of a person's life written by someone else. It aims to present facts, experiences, and insights into the subject's life.

• A. more subjective: Subjectivity (based on personal feelings or opinions) is generally considered a disadvantage for a factual account like a biography, as it can lead to bias and inaccuracy.
• B. more personal to the writer: This implies the biography is about the writer's own life or heavily influenced by the writer's personal connection, which is not the primary characteristic or advantage of a biography (which is about another person). This sounds more like an autobiography or a memoir.
• C. most often written by professionals: While many biographies are written by professionals, this describes the author rather than an inherent advantage of the genre itself. A biography can be well-written by a non-professional or poorly written by a professional.
• D. written from the writer's perspective: This is a key characteristic of a biography. Unlike an autobiography (written by the subject themselves), a biography is written by an external author. This external perspective allows the biographer to conduct extensive research, analyze the subject's life from a distance, incorporate multiple sources, provide historical context, and offer interpretations that the subject might not have. This ability to provide a comprehensive, researched, and often more objective view is a significant advantage.

The fact that a biography is "written from the writer's perspective" (the biographer's perspective) is an advantage because it allows for a researched, analytical, and often more objective account of a person's life, drawing on various sources and historical context, rather than being limited to the subject's own memory or self-perception.

The correct option is D.
$\boxed{\text{D. written from the writer's perspective.}}$