Read this sentence from lines 50 through 52. "By taking what we already know, we can create opportunities for our children to participate in sports while keeping them healthy and safe."
Which lines best support the author's claim in this sentence?

A. "We are already learning a lot about traumatic brain injuries from our returning Afghanistan and Iraq veterans. An estimated 40,000 men and women veterans have been diagnosed with traumatic brain injuries from multiple concussions in combat." (lines 15 through 17)"

B. ''According to the American Association of Neurological Surgeons (AANS), roughly 446,788 sports-related head injuries were treated at U. S. emergency rooms in 2009." (lines 20 and 21)

C. "Recently, the largest youth football league, Pop Warner, announced it will limit the amount of contact and collisions in practice to protect its 285,000 football players (ages 5-15) from potential repetitive brain trauma. This move responded to a recent study of second-grade football players that showed the average player suffers more than 100 head impacts during 5 games and 10 practices." (lines 33 through 37)

D. "Sports-related brain injuries are also receiving more public attention because of the willingness of professional athletes to speak out. For example, more than 2,000 retired NFL players filed a lawsuit against football helmet maker Riddler and the NFL5M for hiding information about dangers of concussions and the consequences of hits to the head." (lines 44 through 48)