I’m pretty sure it’s B :) sorry if I’m wrong
Answer:
After the mistress stopped teaching him, he already knew the alphabet. He made friends with all the little white boys whom he met on the street, and took a book with him on every errand.He traded a bread in return for a lesson of education
Since it is necessary to emphasize the word and from the choices I would go with the one(s) with the quotation marks. B and C are the same, so it is both