The graph at right shows that A. when there is a lot of noise. it is expensive to reduce noise levels further. A O B. it gets cheaper and cheaper to reduce noise to lower levels. Noise Level O C. at point C. the expenditure needed to achieve a given level of noise reduction is more B than at point A D. successive noise reductions of C equal size can be attained at constant cost. O E. at point B. the expenditure needed to achieve a given level of noise reduction is greater Expenditure on Noise Reduction than at point C