The main reason that the author of the passage discounts using a purely acoustic analysis to understand the way in which humans are able to recognize sounds is that A. the physical properties of speech and the perception of those physical properties are qualitatively different B. redundancy, or the excess of information, typically ensures that a signal is faithfully transmitted between two speakers C. no two people process the same cue in exactly the same way D. the relevant distinguishing features of a sound tend to merge different cues into a generalized sound so as to render any analysis ineffectual E. humans ignore certain features of the acoustic sound that may figure prominently into the perception of sound