If We Were to Characterize the Language of School-Age Children

If we were to characterize the language of school-age children, how could we best describe it?

A) The receptive and expressive language skills of most children are fully developed by second grade.
B) The receptive and expressive language skills of most children are fully developed by seventh grade.
C) Receptive language skills are fully developed by second grade, but expressive skills continue to develop at least through seventh grade.
D) Receptive and expressive language skills continue to develop throughout the elementary and high school years.