Answer:
A. He sat in the front section of a bus.
Step-by-step explanation:
The passage says that the group of African Americans deliberately sat at the front of the bus, where "only whites were permitted". This implies that if any person of any other color were to sit there, there would be consequences.
Here, Mr. Hendricks sat at the front, despite knowing that he wasn't allowed to, and refused to move. Because of that offence, he was arrested.
The answer is A.