The correct answer is C) autism spectrum disorder.
The best diagnostic label for Emily is Autism Spectrum Disorder.
This disorder is best known as ASD and is a neurological disorder that presents ist first symptoms in the early years of a child. The child has difficulties to interact and communicate with other people or children. These children do not look you directly to you when you are talking to them, they are obsessive with one thing, and most of the time they appear to be living in their own reality.
The other options of the question were A) intellectual disability. B) expressive language disorder. D) Asperger's disorder.