The correct answer is A. The receiver responds with a return message
Step-by-step explanation:
In the listening process, the last step is to answer with a return message which occurs after sounds are detected by the ear, the information has been transmitted to the brain and the brain assigns meaning. However, this last step is not necessary or possible in all the cases, for example when we listen to an advertisement on television or radio in most cases we do not respond although we understand and analyze the information we heard. Thus, the one that is not necessarily part of the process of listening is "the receiver responds with a return message".