The four graphs below, labeled A, B, C, and D, are scatterplots corresponding to four different sets of bivariate numerical data. **If a least squares regression line was determined for each of these graphs, which set of data would have the highest coefficient of determination $(r^2)$?** [[☃ image 1]] [[☃ image 2]] [[☃ image 3]] [[☃ image 4]] [[☃ radio 1]]