The correct option is A Two
The protrusion on the occipital bone of the skull, that forms a joint with the first cervical vertebra, enabling the head to move relative to the neck is an occipital condyle. Humans have two occipital condyles, that are large rounded kidney-shaped projections of occipital bone, that are located contralateral to the foramen magnum and that articulate with the superior facets of the atlas cervical vertebra.