Final answer:
The thoracic and sacral regions of the spine demonstrate kyphotic curves, which are primary curves. Excessive curvature in the thoracic region is referred to as kyphosis. The cervical region has the greatest range of motion for rotation.
Step-by-step explanation:
The regions of the spine that demonstrate kyphotic curves are the thoracic and sacral regions. These are the primary curves of the spine, and they are present from fetal development. Disorders like kyphosis involve an excessive posterior curvature of the thoracic region. In summary, the correct answer to the question is B) Thoracic and sacral.
Regarding the question of which region of the vertebral column has the greatest range of motion for rotation, the answer is the cervical region. This is because the cervical vertebrae are structured to allow for a high degree of movement in various directions, including rotation.