Which Is True of Prevalence of Childhood-Onset Fluency Disorder

Which is true of prevalence of childhood-onset fluency disorder?

A) It is more common in boys than in girls in early childhood, but equal between genders by kindergarten.
B) The majority of those with childhood-onset fluency disorder also have a learning disability.
C) Approximately 5% of children have problems with stuttering at some point in their early development.
D) Boys are more likely to naturally recover from stuttering than girls are.