GRE Logical Reading: ETS-GRE逻辑单题ETS - HXBPZFEX90Q14YO0J$

Which of the following is an assumption on which the argument depends? A. Mold itself does not create moisture. B. Most homeowners know enough about plumbing to determine whether theirs is in good condition. C. Mold cannot grow in dry areas. D. No varieties of mold are harmless. E. Mold spores cannot be filtered from the air.