The answer is:
It is a chronological narration of how Douglass learned to read, with pauses for explanation.
In the excerpt from "Narrative of the Life of Frederick Douglass," the author Frederick Douglass describes how he learnt to read, starting with the earliest event and following the order in which the occurrences happened. At the same time, he provides details, such as who taught him the alphabet first, why he became so determined to learn how to read, and how he managed to acquire reading skills in spite of his masters' opposition.
