Question 1 out of 5

Q: Researchers recently discovered that 3 out of 4 former NFL players who died between 2008 and 2023 may have been affected with the brain disease chronic traumatic encephalopathy. Why did researchers use statistical methods to estimate the prevalence of CTE among deceased NFL players rather than relying only on previously donated brain samples?

Select your answer:
A. Earlier studies focused exclusively on players who had experienced diagnosed concussions during their careers.
B. Researchers discovered that CTE could be accurately diagnosed in living players without examining their brains.
C. Families who noticed symptoms associated with CTE were more likely to donate brains, potentially making the disease appear more common than it was.
D. The NFL had prohibited researchers from examining the brains of players who retired before new safety regulations were introduced.