A Mother Is Concerned About the Behaviour of Her Seven

A mother is concerned about the behaviour of her seven year old and takes him to a pediatrician. The physician explains to the mother that hyperactivity

A) presents very few problems in a classroom environment.
B) affects 6 to 9 percent of boys between the ages of 6 to 12.
C) does not manifest itself until adolescence.
D) is defined by very precise and narrow characteristics.
E) is more common in girls than boys.