\textbf{The height and age of each child in a random sample of children was recorded. The value of the correlation coefficient between height and age for the children in the sample was 0.8. Based on the least-squares regression line created from the data to predict the height of a child based on age, which of the following is a correct statement?} 
选项为:A:\textbf{~On average, the height of a child is 80\% of the age of the child.}  B:\textbf{The least-squares regression line of height versus age will have a slope of 0.8.}  C:\textbf{The proportion of the variation in height that is explained by a regression on age is 0.64.~}  D:\textbf{The least-squares regression line will correctly predict height based on age 80\% of the time.}  E:\textbf{The least-squares regression line will correctly predict height based on age 64\% of the time.}  请回答其中一个选项.