Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information. A. Unchanging physical laws have limited the size and strength of buildings that can be made with materials discovered long ago. B. Building materials have changed in order to increase architectural size and strength, but physical laws of structure have not changed. C. When people first started to build, the structural methods used to provide strength and size were inadequate because they were not based on physical laws. D. Unlike building materials, the methods of support used in architecture have not changed over time because they are based on physical laws.