Too much arousal in an athlete can lead to
a. a physical and mental state in which injury is impossible.
b. no change in his or her athletic performance.
c. increased muscle tension and attention deficits, thus decreasing performance.
d. decreased muscle tension and attention gains, thus increasing performance.

Explanation:

Arousal is a double-edged weapon because can excite or freak out the athlete, causing tension in his or her muscles and causing attention deficits, having sort of a tunnel vision about the game. As a result, the athlete performance will be decreasing because is gonna be distracted and have a sense of being tired.