The correlation between the height and weight of children aged 6 to 9 is found to be about r = 0.8. Suppose we use the height x of a child to predict the weight y of the child. We conclude

A. the least-squares regression line of y on x would have a slope of 0.8.B. about 80% of the time, age will accurately predict weight. C.height is generally 80% of a child's weight. D.the fraction of variation in weights explained by the least-squares regression line of weight on height is 0.64.