It is true that the stage manager wants to keep a copy of the play <em>Our Town</em> in the cornerstone of the new bank. When the stage manager thinks about this, he is considering what people will think of the play a thousand years from now. He wants people of the future to understand what the past was like. He wants them to learn how people used to live, love, and die. This reveals the stage manager's (and the author's) deep appreciation for simple, common things that are not always present in historical documents.
The correct answer for the given statement above would be TRUE. It is true that the stage manager wants to preserve this play, Our Town in the cornerstone of the new bank. This is for the future generation to know and be informed of the uncomplicated facts of the daily life during the twentieth century. Hope this answer helps.