Which of the Following Statements Is True of Attention-Deficit Hyperactivity

Which of the following statements is true of attention-deficit hyperactivity disorder?

A) attention-deficit hyperactivity disorder is more common for females than for males
B) families of children with attention-deficit hyperactivity disorder have a higher incidence of alcoholism and personality disorders
C) attention-deficit hyperactivity disorder does not usually develop until age 8-10
D) all of the above