A 40-yeаr-оld mаle pаtient presents tо their physician with the fоllowing history and exam findings: Subjective reports: 1 week history of progressive numbness and tingling that began in their feet and now extends to mid-thigh bilaterally Noted weakness in hands and bilateral legs 4 days ago as they began dropping items and tripping frequently Currently notes that they feel short of breath with minimal activity Had a cold 4 weeks prior Objective findings: MMT lower extremities (bilaterally): Ankle Plantarflexion and Dorsiflexion 1/5 Knee Flexion 2/5 Knee Extension and Hip Flexion 3/5 MMT upper extremities (bilaterally): Wrist flexion/extension 2/5 Elbow flexion/extension 3/5 Shoulder Flexion/Abduction 4/5 Reflexes: 1+ in achilles, patella, biceps, brachioradialis, and triceps bilaterally. Which of the following conditions is MOST consistent with this presentation?