Which statement weakens the author's claim that schools should require students to participate in sports? a. the spirit of sportsmanship can one build good relations with people and go a long way in life. b. so, parents are obviously wrong and need to do more research. c. nowadays, children experience a sedentary lifestyle as they mostly remain indoors with their laptops or mobile phones. d. therefore, it is very important that children learn to balance their studies and sports.