The issue of personal space is related to

A．dogs are important too
B．nonverbal communication occurs in varied situations
C．tone of voice affects different ranges of hearing
D．dogs are more capable of nonverbal communication than other animals

A．dogs and humans communicate the same way.
B．gestures and tone of voice convey a great deal of information.
C．our system of communication is changing rapidly.
D．only human beings are capable of verbal communication.