You are answering a USMLE-style medical question. Question: A 5-day-old boy is brought to the emergency department because of a 1-day history of poor feeding, irritability, and noisy breathing. The mother did not receive any prenatal care. His respirations are 26/min. Physical examination shows sunken fontanelles, tightly clenched fists, and erythema around the umbilical cord stump. Which of the following best describes the pathogenesis of the disease process in this patient? Options: A) Inhibition of voltage-gated sodium channels B) Destruction of Schwann cells C) Decreased release of glycine D) Destruction of anterior horn cells Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.