The part of the play which is the best place to set up the period is at the beginning of the play.
The way in which Shandra might do that most effectively is by having a narrator give the audience a brief history of the historical period.
The person who will help establish the time period of the play is the narrator.
This refers to the historical time period or the physical location in which an action takes place.
Hence, Shandra would do her best to include the historical period at the beginning of the play so that the audience would immediately understand and follow the sequence of the play.
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