Also , yesterday my brother chased a black guy who came in and stole shit from our store . He ran after him for miles . Then the black guy got tired and started walking and so did my brother .

Generate a question about the above context.
Why is the brother so upset ?
Choices:
[A]. None of the above choices .
[B]. He was fired .
[C]. He was yelled at by a black guy .
[D]. He was the victim of a crime .