The following is what is parents might be concerned about is:D. Autism spectrum disorder.
Autism spectrum disorder can be defined as a disability or disorder that makes it difficult for a person to communicate or interact with others.
A person suffering from autism disorder have difficult learning and understand people perspectives and they tend to find it hard relating with people.
Inconclusion the following is what is parents might be concerned about is:D. Autism spectrum disorder.
Learn more about Autism spectrum disorder here:https://brainly.com/question/9869588