Answer:
The primary goal of a biographer is to give historical facts about a particular period and person.
Step-by-step explanation:
A biography is a detailed description of a person's life. A person who writes biographies is a biographer.
Biographies are supposed to be objective, i.e. based on facts. They tell about different parts of their subjects' lives, for example, their childhood, education, relationships, family life, important things they've done, events that especially impacted them and their development, etc. Sometimes, historical context is important because we can't understand some historical figures without knowing what was going on around them. This is why biographers sometimes may include historical facts about certain periods as well.
Biographies can also include the analysis of their subjects' personalities but that is not what they focus on.
This is why the third option is the correct one.