Answer:
a. falls.
Explanation:
According to statistical surveys between 2012 and 2013, falls were the main cause of non-fatal injuries among young people aged 15 to 24 years. These falls are caused by the impact on something or someone and mainly by collisions between vehicles, which although causing injuries do not present high levels of severity. This is mainly due to the involvement of people of that age in dangerous and irresponsible behaviors.
