In contrast to amateur athletes who improve their performance primarily through hours of training,
measuring their performance with sophisticated diagnostic equipment better enables professional athletes to focus their efforts and improve their skills quickly.
A) measuring their performance with sophisticated diagnostic equipment better enables professional athletes to focus their efforts and improve
B) measuring their performance with sophisticated diagnostic equipment better enables professional athletes to focus their efforts, improving
C) professional athletes, by measuring their performance with sophisticated diagnostic equipment, are better able to focus their efforts and improve
D) professional athletes, by measuring their performance with sophisticated diagnostic equipment, are better able to focus their efforts and improved
E) the measuring of their performance with sophisticated diagnostic equipment better enables professional athletes to focus their efforts, improving