How are the details of Unoka's life and personality important to the development of the plot in this section?
A. They highlight Okonkwo's ambition and drive for success.
B. They contrast the manners and customs important to Igbo society.
C. They contrast being a failure as a man in Igbo society to Okonkwo's example.
D. They highlight what steps a man in Igbo society must take to be accomplished.