Which of the Following Would the Nurse Share Then Answering

Which of the following would the nurse share then answering parents' questions about the cause of mental retardation?

A) Heredity is the main cause of mental retardation in the newborn and infant.
B) There are many causes; sometimes there is a single cause and sometimes there is more than one cause.
C) Mental retardation begins in utero with fetal development gone wrong.
D) Virus infection in utero is the main cause of mental retardation.