Where is the foramen in this diagram of a bone from the vertebral column?

D is the Answer because its a 3d model

The vertebral column, also known as the backbone or spine, is part of the axial skeleton. The vertebral column is the defining characteristic of a vertebrate, in which the notochord found in all chordates has been replaced by a segmented series of bones-vertebrae separated by intervertebral discs. The vertebral column houses the spinal canal, a cavity that encloses and protects the spinal cord