Professor Lannigan Specializes in Human Behavioral Genetics

Professor Lannigan specializes in human behavioral genetics. Which of the following research methods is she NOT likely to use in her research?

A) study identical twins who have been raised apart
B) compare adopted individuals to their adoptive families and their biological families
C) measure similarities and differences among people who are genetically related in differing degrees
D) use genetic engineering to alter specific genes and then observe the effects on a person's personality traits or behavior