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While many architectural historians have focused on the aesthetic innovation of the early skyscraper, Dr. Elias Thorne argues that the most significant developments were actually in the ______ of structural systems. Over several decades, he notes, builders moved from load-bearing masonry to steel skeletons, a gradual change that allowed for an unprecedented degree of flexibility in interior layout. Which choice completes the text with the most logical and precise word or phrase?

  1. ornamentation
  2. standardization
  3. evolution
  4. simplicity

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