Longitudinal Research on Violent Criminals and the Gene That Results

Longitudinal research on violent criminals and the gene that results in low levels of production of an enzyme called monoamine oxidase (MAO) has revealed that

A) children who possess the gene later became violent criminals.
B) the gene was unrelated to antisocial behaviour.
C) high levels of MAO were related to prosocial behaviour but low levels were not predictive of criminal activity.
D) children with both the low MAO gene and a history of maltreatment were at a heightened risk for criminal behaviours.