Which of the Following Is a Characteristic of Rett's Disorder

Multiple Choice

Which of the following is a characteristic of Rett's disorder?

A) The loss of previously acquired skills, such as the ability to walk and to communicate after three years of apparently normal development
B) Stereotyped behavior from birth
C) A loss of hearing at birth
D) A range of physical, behavioral, motor, and cognitive abnormalities that begin after a few months of normal development