The play is considered innovative because of its stage direction, as shown in option C.
With such deep characters and complex issues, the play needed a good stage direction to express to the audience everything they needed.
The stage direction of "The Glass Menagerie" created a very efficient effect of alienation, as it guided the actors to play characters who were able to deal with the problems they had while remaining alienated, seeking refuge to escape these problems. This was something innovative and served as a model for other plays.
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