Which Conclusion Was Made on Child Outcomes Based on the Brain

Which conclusion was made on child outcomes based on the brain research conducted?

A) Brain development is more important as the child gets older due to the more expectations that will be placed on the child.
B) The most significant development of the brain occurs between the ages of 5 and 8.
C) The brain's development is more influenced by the environment and not by the relationships the child has with adults.
D) Toxic stress during the earliest years of life can have significant negative effects on brain development.