How Do Developmental Psychopathologists Differentiate Normal and Abnormal Child Behavior

How do developmental psychopathologists differentiate normal and abnormal child behavior?

A) Behavior that interferes with children's competence and does not meet the demands of the environment
B) Behavior that leads to psychological distress, impairment, and risk of harm to self or others
C) Behavior that leads to psychological distress, impairment, or risk of harm to self or others
D) Behavior that leads children down aberrant developmental pathways