The correct answer is D) pain at the site of the fracture and possible numbness or paralysis below the injury. This is the correct answer because the primary symptoms of a fractured back are localized pain at the site of the fracture, as well as potential numbness or paralysis in the limbs or body parts below the level of the injury. This is due to damage or compression of the spinal cord, which can disrupt nerve signals to the affected areas. The other answer choices are incorrect because they do not accurately reflect the typical symptoms of a fractured back. Vomiting, involuntary urination/bowel movements (option A), leg cramps (option B), and uncontrolled jerking of the limbs (option C) are not the primary indicators of a spinal fracture.