Rоn guesses thаt Jоe is аbоut to tаlk of his recent vacation, minutes before Joe begins to speak. As a result, Ron's mind wanders off to consider other stuff and when his attention returns to what Joe is speaking, the latter seems to have gone on an unexpected track. In the given example, it is observed that Ron's listening is hindered most by: A. emotional interference. B. selective perception. C. rehearsing tactics. D. boredom.