Researchers studying athletes found that those who played mainly for the love of their sport actually had sharper vision during athletic competitions than those whose main goal was winning a trophy or championship. The vision of the first group of athletes was sharper because the concentration necessary for acute vision during an activity is typically possessed to a greater degree by those whose attention is focused on the activity itself. Which one of the following is most strongly supported by the statements above? ['Winning a trophy or championship is not important to athletes who play mainly for the love of their sport.', 'Athletes who play mainly for the love of their sport concentrate more on the sport itself during athletic competitions than do athletes whose main goal is winning a trophy or championship.', "If an athlete's main goal during an athletic competition is winning a trophy or championship, that athlete will lack the concentration necessary for adequate vision during that competition .", 'It is impossible for an athlete to concentrate on more than one thing at a time during an athletic competition.']