Longitudinal research designs allow researchers the opportunity to study stability or change over time in the same group of individuals as they age. Which of the following research questions would be best addressed using a longitudinal research design? (Select all that apply)
A. Is maternal diet during pregnancy associated with cognitive and social development across the lifespan?
B. What strategies do 5th graders use to solve challenging math problems?
C. What are the benefits of having close friendships at school¸ particularly comparing between four groups of children who are currently enrolled in 2nd grade¸ 4th grade¸ 6th grade¸ and 8th grade?
D. Is being reared in an orphanage or institution early in life associated with more negative cognitive and social development (relative to control children who were reared by their parents in the community) as children age?