An Individual Develops Intellectual Disability Because of a Disorder Called

Multiple Choice

An individual develops intellectual disability because of a disorder called phenylketonuria. Which of the following occurrences is a cause of the intellectual disability in the individual?

A) The replacement of myelin by hard, fibrous tissue in the individual's neurons
B) The inhibition of normal myelin development in the individual's brain
C) Insulation of the neurons by myelin
D) Myelination of the prefrontal matter of the individual's brain