Which of the Following Is a Possible Reason Why Non-Verbal

Which of the following is a possible reason why non-verbal communication has survived despite the powerful communication ability provided by speech?

A) linguistic behaviour may be constructed on top of non-verbal behaviour, which develops before language is acquired
B) it is an innate behaviour
C) it is more useful than speech in the communication of ideas
D) the habit of teaching children how to communicate non-verbally is slow to die out
E) linguistic ability and non-verbal ability are products of precisely the same neural tissues and therefore must co-exist