Why Does the Spinal Cord Develop Before the Limbs

Why does the spinal cord develop before the limbs?

A) The muscle fibers of the arms and the legs directly attach to the spinal cord.
B) Hormones are secreted along the spinal cord to regulate arm and leg development.
C) The nerves must be in place before infants can gain control over their arms and legs.
D) The spinal cord provides structural support for the rest of the body.