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These graphs compare the amount of lead in the air with the amount of violent crime over several decades. Which conclusion do the data support? Studies of the Relationship of Violent Behavior to Level of Lead in the Air Chicago San Diego Atlanta New Orleans 8 8 8 6- 6J 6. 6 1972 1982 1992 2002 2012 1982 992 2012 197 2002 1972 1982 1992 2002 2012- 1972 1982 2012 Natural log of aggravated assault rate - Natural log of atmospheric Pb Text description for chart A. Violent crime is higher when lead levels are higher. B. Violent crime and lead levels appear to be unrelated. C. Violent crime is lower when lead levels are higher. O D. Violent crime is higher when lead levels are lower