medium · SAT Reading & Writing

The development of 'smart glass'—a material that can change its light-transmission properties—has revolutionized sustainable architecture. [When a small electrical voltage is applied, the glass darkens, reducing the need for air conditioning by blocking solar heat.] This technology allows for larger windows without compromising a building's energy efficiency.

Which choice best describes the function of the second sentence as a whole?

  1. It compares the cost of smart glass to that of traditional high-efficiency windows.
  2. It explains the technical process through which the material achieves its benefit.
  3. It suggests that larger windows are detrimental to modern building design.
  4. It claims that smart glass will eventually replace all other forms of building insulation.

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