Every year many people become ill because of airborne mold spores in their homes. After someone becomes ill, specialists are often hired to eradicate the mold. These specialists look in damp areas of the house, since mold is almost always found in places where there is substantial moisture. If one wishes to avoid mold poisoning, then, one should make sure to keep all internal plumbing in good condition to prevent leakage that could serve as a breeding ground for mold.
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. |