Which of the Following Is Associated with Research Examining the DRD4

Which of the following is associated with research examining the DRD4 receptor gene in children?

A) Parental effects on the child's temperament/personality are striking in the early years but have no discernable impact by middle childhood.
B) Maternal levels of positive emotionality predicted shyness in children.
C) Young children demonstrated lower effortful control in the context of negative parenting behaviours.
D) Parental factors had little effect on their children's emotions at any age.