In DSM-IV, Children with ADHD Were Classified into One of Three

In DSM-IV, children with ADHD were classified into one of three subtypes, based on their symptom presentation. In contrast, in DSM-5 does not use subtypes; instead children with ADHD are described in terms of their predominant symptom presentation. Why did the creators of DSM-5 make this change?

A) Clinicians working in mental health centers and hospitals did not find the distinction between the three subtypes useful in their practice.
B) Researchers working at universities did not find the distinction between the three subtypes useful in their research into the causes of ADHD
C) The three subtypes had low reliability over time; children often switched from one subtype to another.
D) The three subtypes all responded to the same type of treatment; medication worked equally well for all children regardless of subtype.