Aristotle says that a plot should have a clear beginning, middle, and end and should feel unified. This is another way of saying _____.

A. that a plot should follow logically from start to finish and feel like everything that happens is necessary
B. that a plot should be fun and exciting, even at the expense of logic
C. that a plot should follow cause and effect and not use songs unless it is a musical
D. that dramatic unity is not a substitute for the logical progression of a story's events