Final answer:
Overall, sport in the United States is dominated by Whites. (option a).
Step-by-step explanation:
Overall, at most levels of competition, sport in the United States is dominated by Whites. According to the U.S. Census Bureau, 76.3 percent of U.S. adults currently identify themselves as White alone. This dominance can be seen in popular American sports like football, baseball, basketball, and hockey, where specific teams have fans inhabiting specific locations. Additionally, historically, the majority of top basketball talent in the U.S. has come from big cities, which have high percentages of black residents, contributing to the predominance of African-Americans in professional basketball. However, in recent years, white players from big cities in Europe, Canada, and Australia have also become more common in the NBA.