The correct answer is C. He is nervous.
Explanation
The text talks about Johan, a boy who wanted to belong to the football team at his school and was aware that he had not done his best during the audition. However, he expected that the coach would choose him to belong to the team. When the coach was announcing the chosen ones over the loudspeaker "His heart was beating like a hummingbird's wings as I heard the coach voice", this indicates that Johan was very anxious and nervous about the results, and due to this his heart was beating very fast. According to the above, it can be inferred that Johan was nervous because he was expectant about the coach's decision, in addition, his heart was beating fast. So the correct answer is C. He is nervous.
