How Can Autism Be Differentiated from Asperger Syndrome

How can autism be differentiated from Asperger syndrome?

A) Autism can involve failure to develop age-appropriate relationships with peers while children with Asperger syndrome do develop age-appropriate relationships with peers.
B) Children with autism may have no spoken language or delayed language development while children with Asperger syndrome have no clinically significant delay in speech development.
C) Children with Asperger syndrome may have repetitive patterns of behavior while those with autism do not.
D) Children with Asperger syndrome may lack the ability for imaginative play while those with autism do not.