How Does the Sound Design of the Opening Scene in Once

How does the sound design of the opening scene in Once Upon a Time in the West (1968) function?

A) It intentionally thwarts the audience's spatial and temporal expectations.
B) It answers fundamental questions about the narrative.
C) It helps the audience distinguish the individual sounds and understand how they are arranged in relation to one another.
D) The audio mise-en-scène emphasizes the camaraderie of three desperadoes.
E) The various nondiegetic sounds help us understand Harmonica's point of view.