In the Human Brain, a Great Deal of Synaptic Pruning

Multiple Choice

In the human brain, a great deal of synaptic pruning occurs in early childhood. This pruning appears to be:

A) The unfortunate result of insufficiently stimulating home environments
B) An adaptive process that allows children to deal more efficiently with their environment
C) Due to an imbalance of important nutrients, and especially to low levels of the B vitamins in many children's diets
D) Reflective of the fact that the forebrain is slowly taking over responsibility for functions that have previously been regulated by the hindbrain and midbrain