SAT Text Structure and Purpose Question

The metal featured in both the structure of the Shimogamo Machiya Villa by Takuma Ohira and the hardware in the One-Room Residence of 5 Layers by Matsuyama Architect and Associates is representative of a trend in contemporary Japanese interior design to juxtapose sleek, modern accents with traditional organic materials such as cypress. The prominent featuring of metal stems from the post-World War II emphasis on technological progress, while more traditional natural materials help preserve longstanding architectural and aesthetic approaches. Which choice best describes the overall structure of the text?