What is the central claim of the passage?
A. Too much is asked of Olympic-level artistic swimmers, who should have less rigorous training schedules.
B. Artistic swimmers are better than water polo players because they work harder and smile through it.
C. Due to the range and difficulty of what is required, artistic swimming is the toughest Olympic aquatic sport.
D. Artistic swimming does not get the respect and attention it deserves because its athletes are mostly female.