What concept is defined as knowledge and experience in a specific domain?

In the past month, 11 year-old Christopher has been caught torturing two cats. He also stole a car from the neighbors, burned down his parent's shed, and beat up some kids at school. He might meet clinical criteria for _____

a. Antisocial Personality Disorder b. Generalized Anxiety Disorder c. Oppositional Defiant Disorder d. Attention-Deficit Hyperactivity Disorder

Which of the following siblings would have the most similar IQ scores?

a. children and their adopted siblings b. siblings who have the same biological parents c. fraternal twins d. identical twins