Answer the following question given this paragraph: Brain injuries can range from mild to extremely severe, but even mild injuries need medical attention. Brain injuries can result from falls, car accidents, violence, sports injuries, and war and combat. Falls are the most common cause of brain injuries, particularly in older adults and young children. Q: What are the most common causes of brain injuries? A:

Options are:
a). excessive shaking;
b). lightning strikes;
c). alcohol poisoning;
d). falls;
Answer:
d).