What Must Be True About Babbling If Infants Who Are

Multiple Choice

What must be true about babbling if infants who are learning sign language show evidence of manual babbling (using sign-language-based babbling) , but other infants show only vocal babbling?

A) It is related to maturation processes that are unrelated to speech.
B) It is important for development of more than just language and vocal skills.
C) It is related to language acquisition in general, rather than just vocal speech.
D) It is related to motor development in general.