Research suggests that children with Asperger's syndrome may have many of the social and behavioral characteristics of autism, but without marked delays in language and cognitive development, and without a significant range of motion in upper extremities. What are the characteristics of Asperger's syndrome in comparison to autism?
a) marked delays in language and cognitive development
b) degree of stereotypic behavior
c) age of onset of characteristics of autism
d) range of motion in upper extremities