A previously normal child begins deteriorating developmentally at about 6 months of age. She is seen by an ophthalmologist because she no longer responds to visual stimuli. Ophthalmoscopic examination finds a region of cells around the fovea centralis with a cloudy, milky appearance. The enzyme that is deficient in this child normally carries out which of the following functions?

1. A)Degradation of glycogen in muscle
2. B)Synthesis of glycoproteins in the liver
3. C)Degradation of mucopolysaccharides in bone marrow
4. D)Degradation of glycolipids in the brainGABARITO
5. E)Synthesis of peptides in the spleen