The most important detail to include in a biography is "significant events and people who were part of the subject’s life," as stated in option A.
A biography is a type of literary work in which the story of someone's life is told. However, the one doing the telling is not the person the story is about. For example, if you write a book about Nelson Mandela's life, you will be writing a biography.
It would be important to include significant events and people who were part of the subject’s life. Anything that influences the subject, his or her life and actions should be included in a biography.
With the information above in mind, we can choose option A as the correct answer.
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