Which Types of Adoption Studies Should a Nurse Recognize as Providing

Which types of adoption studies should a nurse recognize as providing useful information for the psychiatric community?

A) Studies in which children with mentally ill biological parents are raised by adoptive parents who were mentally healthy
B) Studies in which children with mentally healthy biological parents are raised by adoptive parents who were mentally ill
C) Studies in which monozygotic twins from mentally ill parents were raised separately by different adoptive parents
D) Studies in which monozygotic twins were raised together by mentally ill biological parents
E) All of the above