Answer:
c) Written by the person it is about.
Step-by-step explanation:
Biographies and autobiographies tells about a real person and the details of his or her life, including the major influences and their childhood home.
Only an autobiography is written by the person it is about. Biographies are written by someone else.
All other options (a, b, and d) are found on both biographies and autobiographies.
So, C is not a characteristic shared by both biographies and autobiographies.