According to the analysis, health is not only the absence of disease, but also a good state of physical, psychological and social adaptation. As students, a healthy life not only needs to strengthen physical exercise and improve personal hygiene, but also needs to maintain a happy mood and a positive attitude. At the same time, we should also learn to get along with others and maintain good interpersonal relationships.
A classmate described in the title is an elite athlete in the class, which shows that she is in good health, but her willfulness and selfishness at ordinary times show that she is mentally unhealthy and can't get along with her classmates, so her classmates don't like her.
So choose: C.