Answer:
a. autistic disorder.
Explanation:
Autistic disorder -
It is the development and neurological disorder which is seen in the first three year after the birth .
The children suffering with the disorder of autistic , tends to live in their own world , showing no response to the present environment and lack of interest .
These children show very odd and strange behavior and even these children lack any eye contact , and avoid communication and interest on the present environment.
Hence, from the question,
Robin is also suffering from the similar disorder of autistic .