Question

Which is not a twin/adoption study? A researcher gives birth to twins and gives them up for adoption to two different families, but later studies how their personalities differ. A researcher compares the personalities of identical twins separated at birth, adopted into different families. A researcher compares an adopted child's personality with the personalities of her biological and adoptive parents. A researcher compares the personalities of identical twins separated at birth, adopted into different families and reunited as adults.

          Which is not a twin/adoption study?
A researcher gives birth to twins and gives them up for adoption to two different families, but later studies how their personalities differ.
A researcher compares the personalities of identical twins separated at birth, adopted into different families.
A researcher compares an adopted child's personality with the personalities of her biological and adoptive parents.
  
A researcher compares the personalities of identical twins separated at birth, adopted into different families and reunited as adults.

Added by Carla T.

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