Which excerpt most accurately shows why Douglass wrote this
narrative?

Frederick Douglass was a teaches slave who became a prominent activist, author and public speaker.
What is Slave?
The practice of owning slaves is referred to as "slavery." A person who is under the ownership and control of another instructions.
Three slave stories by Frederick Douglass were written and published: A Narrative of the Life of Frederick Douglass, an American Slave (1845), My Bondage and My Freedom (1855) and Life and Times of Frederick Douglass (1881).
As a result, option (c)"...if you teach that (slave) (speaking of myself) how to read, there would be no keeping him. It would forever unfit him to be a slave." is correct.
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