why not E？

@Crystal this is a Must Be True question so we are looking for the answer choice that is directly supported by the information in the passage. The problem with (E) is that in the stimulus, the toxins referred to are being released by some cleaning fluids. As such, (E) is not necessarily true since we do not know if these houses are using such cleaning fluids. Notice that (D) is much more general statement, "Keeping houseplants can compensate for some of the negative effects of poor ventilation." This is directly supported by the example provided in the passage. Hope this helps! Please let us know if you have any other questions.

How did we jump from Very well ventilation to “Poor Ventilation”?