Which Statement About Children Who Are Deaf or Hard of Hearing

Which statement about children who are deaf or hard of hearing is NOT correct?

A) They usually fail to catch up linguistically with their hearing peers while they are at school.
B) They usually exhibit some "home signs" when they come to school.
C) They begin school at a more developmentally appropriate level if they come from a family in which sign language is begun during infancy.
D) They are often deficient in cognitive abilities as well as in language skills.