Lucas is in grade two and his parents have just been called in for a meeting with his teacher. His teacher reports that Lucas is not listening to the classroom rooms and talking back. She reports that he is not physically aggressive but can sometimes say hurtful things to other children. Lucas' parents also report that he has a hard time following rules at home and engages in frequent arguments with them and his little brother. According to the DSM-5 Lucas may be diagnosed with: a. Oppositional Defiant disorder b. ADHD c. Autism Spectrum Disorder d. Conduct Disorder