Studies of the infant brain show signs of what scientists call synaptic pruning. What occurs during this process?

a. The brain creates additional neural connections by removing parts of the surrounding bone.

b. Unused synaptic connections and nerve cells are cleared out to make way for new cells.

c. New cells work to “rewrite” old cells and ultimately change their functioning.

d. New cells will not develop until the body makes sufficient physical space within the brain.