An 8-month-old boy is brought to the pediatri- cian by his parents because he has recently lost the ability to crawl or hold his toys. On exami- nation the patient is tachypneic and breathing with considerable effort; the liver is palpable five finger widths below the right costal margin. X-ray of the chest reveals cardiomegaly. He has a difficult time sitting upright and cannot squeeze the physician’s fingers or the ring of his pacifier with any noticeable force. Despite a number of interventions, the child’s symptoms continue to worsen until his death two weeks later. On autopsy, it is likely that this patient’s cells will contain an accumulation of which of the following substances?
(A) Glucose
(B) Glycogen
(C) Oxaloacetate
(D) Pyruvate
(E) Urea