Andrew finds it difficult to socialize and communicate with his peers in school. He often sits by himself for hours and busies himself in drawing in all his books. Andrew's teachers and parents have also noticed that he displays no interests in activities other than drawing. Which of the following best describes Andrew's psychological disorder in this scenario? A) Major depressive disorder
B) Attention-deficit/hyperactivity disorder
C) Autism spectrum disorder
D) Disruptive mood regulation disorder