About 12 days after a mild upper respiratory infection, a 12-year-old boy complains of weakness in his lower extremities. Over several days, the weakness progresses to include his trunk. On physical examination, he has the weakness described and no lower extremity deep tendon reflexes, muscle atrophy, or pain. Spinal fluid studies are notable for elevated protein only. The most likely diagnosis in this patient is
Bell palsy Muscular dystrophy Guillain-Barre syndrome Charcot-Marie-Tooth disease