Buck Has a Friend Who Is Deaf and Was Born

Buck has a friend who is deaf and was born to deaf parents who used sign language.It is most likely that his friend

A) developed sign language in much the same way Buck learned to speak.
B) learned sign language as a whole rather than a series of stages.
C) has not learned to sign because he can lip read.
D) developed a secret language with his parents that only they can understand.