medium · SAT Reading & Writing

In her study of urban heat islands, climatologist Elena Rossi observed that high-density concrete structures absorb significantly more solar radiation than vegetation-heavy areas. [Admittedly, the initial cost of retrofitting existing buildings with 'green roofs' is substantial for most municipal budgets.] Nevertheless, Rossi argues that the long-term energy savings and public health benefits outweigh these early expenditures.

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

  1. It suggests that Rossi's study is fundamentally flawed due to its focus on budgets.
  2. It presents a comprehensive financial breakdown of green roof installation costs.
  3. It acknowledges a potential drawback of the solution the author ultimately supports.
  4. It refutes the claim that urban heat islands are a significant environmental concern.

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