Your answer is B. preposition
I would have to go with. "a journalist."
Hey mate!
You stuck?
I remember this story! :)
The answer is B. Asking the white children in his neighborhood to help him learn to read. In chapter VII, the quote, "Douglass's plan to learn to read centered on making friends with the poor white children of Baltimore and learning from them a little at a time," gives evidence of this fact.
Hope this helps! :)