Final answer:
Football is the youth sport that accounts for 40.5% of concussions. This contact sport has a high incidence of such injuries, underscoring the need for awareness and safety measures in youth sports.
Step-by-step explanation:
The youth sport that constitutes 40.5% of concussions is Football (C). Concussions are the mildest and most common type of brain injury among adolescents and can cause symptoms such as headache, drowsiness, and confusion. While other sports like soccer, basketball, and baseball can also lead to concussions, football, being a contact sport, has a higher incidence rate of concussive injuries due to the nature of the game. It is important for youth participating in sports to be aware of the risks and for coaches and parents to ensure proper safety measures and protocols are in place.