Final answer:
The LAO (Left Anterior Oblique) projection of the cervical spine demonstrates the left intervertebral foramen.
Step-by-step explanation:
The cervical spine projection that demonstrates the left intervertebral foramen is the LAO (Left Anterior Oblique) projection. In this position, the left intervertebral foramen is opened and best demonstrated due to the angle of the X-ray beam and the orientation of the cervical spine. The intervertebral foramen is an opening through which a spinal nerve exits from the vertebral column, created by notches in the margins of the pedicles of adjacent vertebrae when the vertebrae are aligned together.