The Proscenium Is Important Mainly Because It

The proscenium is important mainly because it

A) allows a character on stage to reveal her or his inner thoughts to the audience.
B) creates an invisible fourth wall that separates the audience from the actors.
C) identifies the moment when a character recognizes that tragic circumstances are her or his own fault.
D) provides a handy, if implausible, resolution to a difficult problem in a play.