Solution:In a proscenium theatre, the spatial arrangement from up-stage (back) to down-stage (front, towards the audience) is as follows:
C. Cyclorama - A large curtain or wall at the very back of the stage (up-stage).
B. Wings - The side offstage areas, but positioned in front of the cyclorama.
D. Tormentor - Vertical flats or drapes near the proscenium opening that help frame the stage.
E. Proscenium Arch - The architectural frame through which the audience views the stage.
A. Apron - The part of the stage that extends beyond the proscenium arch towards the audience (down-stage).
Thus, the correct sequential order is: C, B, D, E, A.