Directions: In the question below, a situation is given, followed by statements that may or may not be possible reasons for the situation. Select the option that best describes the reason for the situation in the question. 

Situation: The American Academy of Pediatrics, the American Academy of Child and Adolescent Psychiatry, and the Children's Hospital Association declared a national emergency in child and adolescent mental health in the fall of 2021. This may be a contributing factor to the increase in school shooting incidents across the US.

I. During the past two decades more than 85% of school shootings in the US have been committed by people younger than 25, and the majority by children under 18.

II. According to the National Alliance of Mental Illness, nearly 20% of high school students have seriously contemplated suicide, and 9% have attempted suicide.

III. While in the past it was easier for adolescents to talk to a trusted adult in their extended family during turbulent times as it was common for three generations of a family to live nearby, it has become rare these days with the prevalence of nuclear families.