Question

A memoir describes past events, but it is not considered a historical document. Why?

A. 

because a memoir does not include many facts

B. 

because a memoir relates only the experiences of others

C. 

because a memoir relies largely on the writer's memories

D. 

because a memoir is not written by a historian


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Answer 1

The best answer is C.
A historical document needs to be as accurate as possible and a memoir is not as reliable.