Answer: To show the animals increasing resistance to napoleon
I believe the answer is C: Because a memoir relies largely on the writer's memories. A memoir is a type of autobiography, so that seems to be the most likely answer.
Henry David Thoreau was an American philosopher who spent time in jail as a display of Civil disobedience, arguing that all citizen have a civil responsibility to challenge injustice.
But his experience in jail did not hurt his spirit; he certainly applied one of his famous quotes "<em>This world is but a canvas to our imagination</em>" so what is stronger than prison is a person's free mind.