Answer:
A: Cause/Effect organization
Explanation:
In the passage, you can see one thing slowly leads to another: Oedipus accidentally kills his father, and because of that Jocasta kills herself, leaving Oedipus to resign from the throne. If Oedipus had not killed his father, then Jocasta wouldn't have killed herself, and he wouldn't have left the throne.
Kingsolver's tone shifts to more factual over page 50 and ahead.
The delivery of a speech helps the audience understand the topic, what you're talking about, and keeps the speech on track.
For example, if you were giving a speech on Romeo and Juliet, you wouldn't want to get off topic by giving information about Shakespeare's life instead of information and analysis of the play.