Final answer:
The joint between the vertebrae and the discs in the spine (option D) represents a symphysis joint, as they are joined by fibrocartilage in an intervertebral symphysis, enabling limited movement between them.
Step-by-step explanation:
The student asked about an example of a symphysis joint. The correct answer is D. The joint between the vertebrae and the discs in the spine is a type of symphysis, which is formally known as an intervertebral symphysis. Here, the adjacent vertebrae are united by fibrocartilage, allowing for limited movement between them. This type of joint falls under the functional classification of an amphiarthrosis, meaning it is slightly moveable.
Options A and C (joints between bones in the skull and between radius and ulna in the forearm) are not symphyses but rather synarthroses and syndesmoses, respectively, both of which are types of fibrous joints. Option B (joint between a tooth and the mandible) is a gomphosis, which is also a fibrous joint, not a symphysis.