Answer:
The details of this excerpt reveal the author’s purpose by
b. including facts and details about the topic.
Step-by-step explanation:
This excerpt does not at any moment explain why the fans acted the way they did. We can only come up with assumptions, but nothing is clear. We are not told why they screamed those insults nor why they "feel the heat". We can eliminate option A.
Option C is also wrong since the author does not address the reader. There is also no encouraging of beliefs. We are told how the characters feel, but the author does not establish a sense of right and wrong, or of just and unjust.
Option D can also be eliminated. The author does not express any opinions concerning a topic. Again, we know how Neto and Andy feel about the fans' behavior, but that is all.
We are thus left with option B. The details the author gives us about the way the characters feel are enough for us to elicit the topic of the excerpt. It certainly concerns racial prejudice and how it affects people.