"Yet every one of these disasters has actually happened somewhere, and many real communities have already suffered a substantial number of them. A grim specter has crept upon us almost unnoticed, and this imagined
tragedy may easily become a stark reality we all shall know."
B. It's merchant's.
Have A Nice Day.
A (A.) biography is a complete analysis and telling of the life story of a person who is not the author.
A memoir is a compilation of (B.) memories about moments or events in the life of the author.
However, the information provided in both the works is supposed to be (B.) factual.
These are the answers for Plato users;
Hope this helps <3
( A) compare and contrast