Which of the following is a disadvantage of dry cleaning carpets?

Dry cleaning carpets does come with a notable disadvantage in its effectiveness on heavy stains, which is why this answer stands out. The dry cleaning method typically involves the use of chemical solvents to clean the carpet rather than relying on water or moisture. While this approach can be beneficial for certain types of soils and facilitate a quicker cleaning process, it tends to be less effective when it comes to deeply embedded or heavy stains.

Heavy stains, such as those caused by spills that have set in or substances like mud or pet accidents, often require more moisture and agitation to fully lift from the carpet fibers. Because dry cleaning does not use water in significant amounts, it may not penetrate as deeply to break down these stubborn stains effectively. Hence, individuals dealing with serious stain issues might find this method inadequate, leading to the choice being appropriate.

In comparison, other options present disadvantages that do not accurately align with dry cleaning practices. For instance, the method is characterized by low moisture, and while costs can vary depending on several factors, they don't intrinsically increase due to the dry cleaning process. Additionally, dry cleaning typically provides quicker drying times due to lower moisture usage. Thus, the assertion about its effectiveness, particularly for heavy stains, is a key differentiator defining its disadvantages