The correct answer is Biography
Explanation:
Non-fictional texts that focus on the life and experiences of a person are known as biographies. Moreover, these texts are classified as autobiographies if the author and the person described in the text is the same or as biographies if the author of the text is different. The text Sarah read can be classified as a biography because the main topic of it was the life of a person (Lucille Ball) but it was not Lucille Ball the one who wrote it.
