The pH levels and mercury levels of several lakes throughout Ohio are measured. Researchers do a regression analysis based on these measurements in order to predict mercury levels from PH levels. The equation is mercury level = 1.231 - 0.142(pH level) with /2 = 0.64. The correlation between mercury level and pH level is A. 0.64. B. 64%. C. -0.80. (correct) D. 0.80. E. -0.142