Setting and historical events play a secondary role.
The topic and the personality of the subject play a primary role in good biography whereas historical context and events play a supporting role.
A biography is a description of someone's life that was written by another person. Biographies are mostly nonfiction by definition, yet there is a genre called fictional biography.
Since biography is about a person's life, the primary subject is the person and his personality. Setting and historical events are secondary as these need to be finalized later and belongs to the subject only.
Thus, the correct option is C that is secondary role.
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