Why Is It So Inaccurate to Presume That Most Children

Why is it so inaccurate to presume that most children with ADHD will simply "grow out" of their difficulties?

A) Because ADHD is known to be a progressive illness that, in most cases, actually gets more severe over time.
B) Because ADHD cannot be formally diagnosed prior to the age of 12, so a child who has ADHD symptoms automatically becomes an adolescent with such problems when they reach their twelfth birthday.
C) Because research shows that more than half of such children will continue struggling with their difficulties into adolescence or young adulthood.
D) Because proper medication combined with psychotherapy can nearly eradicate the symptoms of most ADHD cases prior to the age of 10 years.