Question

The following are all components of what?

Answer 1

They answer cannot be D, because the positioning of actors on the stage isn't one of Aristole's elements of drama. 
It cannot be C, because costumes aren't a part of stage directions.
It can't be B, because costumes aren't a part of dialogue.

Therefore, the answer must be (A) staging, because it's the only one that includes them all.