Which of the Following Pertains) to Motor Development

Question

Which of the following pertains) to motor development?
A) Nerve fibers become myelinated
B) Cortical centers inhibit subcortical centers
C) Development proceeds in a cephalo-caudal head-tail) and proximal-distal medial-peripheral) direction.
D) All of the above

Accepted Answer

All of the choices pertain to motor development. 
A) Nerve fibers becoming myelinated helps with the transmission of signals and improves motor coordination.
B) Cortical centers inhibiting subcortical centers allows for precise and coordinated movements.
C) Motor development proceeds in a cephalo-caudal and proximal-distal direction, meaning that control of the head and trunk comes before control of the limbs, and control of the torso comes before control of the hands and fingers.