​Jim is a teen who has no friends. Although he is quite verbal, he speaks in a strange and formal style of speech. Jim is obsessed with airplanes and behaves in a very strange way. He is very self-focused and does not understand the concept of social reciprocity. The most likely form of autistic spectrum disorder affecting Jim is _____________.
a. childhood disintegrative disorde
b. Rett's disorder
c. Asperger's disorder
d. autistic disorder