A 35-year-old male with a 1-week history of progressive pain radiating from the lumbar spine down the back of the leg presents to the ED. His physical examination is normal except for complaints of back pain with movement. What is the MOST appropriate imaging test?
(A) No imaging is necessary; attempt conservative therapy.
(B) Obtain plain films of the lumbar spine.
(C) Perform MRI.
(D) Perform CT.