What element of tone is unique to a stage production?

A. Sound

B. Word choice

C. Conflict

D. Plot

The correct answer is A. sound.

Sound is something that appears in plays, but cannot appear in a poem or a novel. You can actually hear the actors saying their lines, whereas you can only imagine what characters in a story or a poem sound like. Word choice, conflict, and plot can appear in both fiction and stage production, but sound is unique to the latter.