Industries waste large amounts of valuable water. Government subsidies allow industries to pay little or nothing for water. Ttherefore, if industries are required by the government to pay full price for the water they use, inefficient use of water by industry would soon cease altogether. A flaw in the argument's reasoning is that the argument ['bases its conclusion on an ambiguous interpretation of the word "inefficient"', 'draws a conclusion that is stronger than what is warranted by the evidence presented', "offers as evidence considerations that have no relevance to the argument's conclusion", 'presents one possible solution to a problem as the only solution to that problem']