One of the Reasons It Is Difficult to Study the Developmental

One of the reasons it is difficult to study the developmental course of maltreatment is that:

A) maltreatment may be only one of several risk factors in a child's life.
B) many types of abuse are difficult to detect before a child is diagnosed with a psychiatric disorder.
C) maltreatment usually occurs before a child has sufficient coping strategies to buffer its long-term impact.
D) it is a diagnostic category that is often overused.