Problem: The main claim of the Source and Filter Theory of speech production is:
(Highlight your answer any way you want, just make sure it's clearly visible.)
(a) The harmonics of the glottal source filter the formants to aid speech perception.
(b) The shape of the vocal tract is not relevant for the acoustics of speech sounds.
(c) Humans communicate by creating various sounds (source) and their auditory system then filters some of that sound in order to identify the acoustic cues necessary for the correct identification of the phonological units in that message.
(d) The sound of speech results from combining the glottal source and the filtering effect of the vocal tract.
(e) There is no such thing as the Source and Filter Theory of speech production.