Which of the following, if true, most strengthens the argument? A. The levels of the compounds typically used in boat paints today are lower than they were in boat paints manufactured a decade ago. B. In high concentrations, the compounds are toxic to many types of marine animals. C. The compounds break down into harmless substances after a few months of exposure to water or air. D. High tissue levels of the compounds have recently been found in some marine animals, but there is no record of any of those animals dying in unusually large numbers recently. E. The compounds do not leach out of the boat paint if the paint is applied exactly in accordance with the manufacturer's directions.