The Scene of the Cavalry Rescue in John Ford's Stagecoach

The scene of the cavalry rescue in John Ford's Stagecoach

A) demonstrates how sound can call our attention to events happening offscreen.
B) shows that manipulation of a sound's fidelity can be used to create a striking transition.
C) greatly exaggerates the volume of the rifle shots to convey the characters' subjective reactions.
D) is an unusual case of a major action sequence being played with no music at all.