Jason's Son, Yves, Has Developed Intellectual Challenges Due to a Disorder

Jason's son, Yves, has developed intellectual challenges due to a disorder called PKU. What role does myelin play in Yves's disorder?

A) He has excessive myelination.
B) His body did not form myelin in his brain.
C) His myelin travelled into his soma and destroyed the neuron.
D) His myelin covered the dendrites and stopped the communication process.