Which quotation most accurately explains why Douglass wrote this narrative?

"The very decided manner with which he spoke, and strove to impress his wife with the evil consequences of giving me instruction, served to convince me that he was deeply sensible of the truths he was uttering."
"The plan which I adopted, and the one by which I was most successful, was that of making friends of all the little white boys whom I met in the street."
"These words sank deep into my heart, stirred up sentiments within that lay slumbering, and called into existence an entirely new train of thought."
"Whist I was saddened by the thought of losing the aid of my kind mistress, I was gladdened by the invaluable instruction which, by the merest accident, I had gained from my master."