Problem: A 49-year-old man presents with nonradiating back pain lasting for 8 months. He reports the recent death of his wife. He states his back pain has become unbearable. He cannot identify any aggravating factors, though he states that drinking a few beers mildly alleviates his pain. He works in a construction company and routinely lifts heavy weights. The physical examination findings, including his vital signs, are unremarkable. His lumbar spine x-ray results indicate no pathology. Which of the following is the most likely direct underlying mechanism driving an exacerbation of his pain? Need Assignment Help? A. Inflammation of herniated disc B. Spinal stenosis resulting in compression of spinal canal contents C. Inflammatory visceral pain D. Maladaptive neuroplasticity in the central and peripheral nervous system