Sentence 3, I believe is your answer.
Answer: It provides an inference drawn by the Narrator, answer C
Explanation: C
The answer would be D. "That experience has led her to understand what she is made of." This is because the theme is the message that is given through reading the story. When you understand what you are made of you are learning a lesson.
Answer : help explain
Explanation: it wouldn't make sense if u said focus or describe