I will give out the brain thing and extra points please help me
The conversation between Dally and the doctor ( last paragraph on p.147 though paragraph 2 on p. 148) is most likely included to show that -

Question 2 options:

1. People of different educational levels respond differently

2. The doctor recognizes the reason for Dally's threatening behavior

3. Dally believes violence is the way to get what he wants

4. Dally think of Johnny as a brother