Answer:
D. The play has come to represent teenagers' unserious relationships.
Step-by-step explanation:
The original sentence compares the play to a saggy burlap dress, which is a metaphor. The metaphor implies that the characterization of the fleeting passions of teenagers in the play is unflattering and unattractive. Option D restates the key point by directly stating that the play has come to represent teenagers' unserious relationships, which is in line with the original sentence's metaphorical comparison. Options A, B, and C do not accurately restate the key point made in the original sentence.