The answer would be A. Another possibility is C. Hope this helped :)
A. Definition and example
The answer is "introduce the play with stage directions to the audience". The Stage Manager is the main character of "Our Town" play written by Thornton Wilder in 1938 about a town named Grover's Corner. This play is a metatheatrical play where there is an interaction between the character of the play and the audience.
Wow! This the first time a heard such an intelligent fact