Read these sentences from paragraph 4.
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. As many of these as I could, I converted into teachers. With their kindly aid, obtained at different times and in different places, I finally succeeded in learning to read.
How are the ideas organized in the sentences?
A. problem and solution
b.chronological order
c.description
d.cause and effect