Which of the following is an assumption on which the assertion made above is based? A. The alternatives to CFC's currently available are not widely used because they are not familiar to a sufficient number of industry scientists. B. The alternatives to CFC's are less hazardous to public health than are CFC's. C. Private industry has a responsibility to take voluntary measures to safeguard public health and absorb the costs of such measures. D. The use of CFS's can result in employee time lost because of illness. E. CFC's are currently the most serious public health hazard engendered by industry in the United States.