With Respect to the Spectral Content of a Sound, Which

With respect to the spectral content of a sound, which of the following statements is TRUE?

A) Pitch is an important cue for grouping a complex auditory waveform into discrete objects.
B) Men and women speak at very similar pitches, making very hard for the auditory system to separate their voices.
C) The auditory system perceives the pitch of a voice as its fundamental frequency, which corresponds to the highest harmony in the sound.
D) Harmonicity cannot be used as a cue for segregating complex sounds in distinct auditory objects.