A: He is growing angry at the accusations being made against him.
Explanation:
When reading in the excerpt, you can tell that Steve's tone of voice and wording is quite aggressive. He seems really annoyed at Charlie. It also says he interrupts Charlie in the stage directions, which is again, quite aggressive. By reading the excerpt closely we can understand Steve's tone and formality. By reading we can interpret how he is growing angry. So, option A makes the best sense.
