In a study of streams in the Adirondack Mountains, the following relationship was found between the water's pH and its hardness (measured in grains). Is it appropriate to summarize the strength of association with a correlation? 8.0 7.6- 72 6.8- 64 125 250 375 500 Hardness (grains) Choose the correct answer below. OA. All the conditions for correlation are met. OB. The scatterplot is not linear; correlation is not appropriate. OC. The scatterplot has outliers; correlation is not appropriate. OD. The variables are not quantitative; correlation is not appropriate.