7. Which of the following is a reason that all biographies may be biased or unbalanced?

A. Biographers must rely on their memories of events.

B. Biographers are historians who did not know their subjects.

C. Biographers are writing long after their subjects have died.

D. Biographers must make choices when they select the events they will write about.

D. Biographers must make choices when they select the events they will write about.

Explanation:

from the question there is the word bias so it means there is preference on something

Would a biographer have memories about the life someone else lived (lives)?

Would every biographer select the same things to include in a biography? If not,what  would the choices between pieces of information show about the biographer?

Are all biographies about dead people?

Are all biographers writing about people they don't know, especially after they research or interview?

Biographers must take choices when selecting the events to write about.

Why?

A) is false, because not all biographers "remember" the person they are writing about.  (Some write long after the person is dead.)

C) is false, because not all biographies are written long after the person is dead.  (Some are written when the person is still alive).

B) is false, because some biographers actually DO know their subjects.

So the only real option is D) ... you can't write about EVERY event that takes place in the subject's life.