The Range of Motion as Well as the Direction of Motion

The range of motion as well as the direction of motion for the various regions of the spine differs.For example the lumbar spine is capable of flexion and extension but little rotational movement.While the thoracic spine rotates with little flexion or extension.This is due to variation in ________.

A) the orientation of the superior and inferior articular facets
B) the composition of the intervertebral disks
C) the arrangement of muscular attachment to the spinous processes
D) the thickness of the intervertebral disc