GRE Reading Comprehension: PPO-GRE阅读PPO - G93YTHH81C3E8CALR

Which of the following most logically completes the argument? A. any formaldehyde-releasing insulation installed before the ban has long since stopped releasing formaldehyde B. many items in a typical home release measurable quantities of formaldehyde C. the insulation that releases formaldehyde was easy to install in an existing house D. almost all of the fresh air that enters a weatherized house enters through heating and cooling vents E. certain other kinds of insulation present other health risks if not used properly