Directions: Select the word that replaces the given expression

She was working on writing a novel on Abraham Lincoln's life.

A biography is a written account of a person's life written by someone else, which matches the description of writing about Lincoln's life. An autobiography is written by the person themselves. A lexicographer compiles dictionaries, and 'Anonymous' refers to an unnamed author, not a book type. Since the subject is writing about another person's life, biography is correct.