An athlete's arousal level refers to
D. the "mind-set" of the athlete in reference to competition and intensity of the exercise or sport.
All of these do seem like possible injuries that could happen in sports the answer that makes the most sense to me is B since it seems like getting arthritis from sports injuries does not seem that common,
A good idea what one could do in the off-season (considering one would do seasonal sports such as skiing) would be to either engange in activities that will preserve fitness - b, or to relax and recuperate; depending on the desire and wishes of the person - a.
The main symptom of dehydration is dizziness/delirium.