Which one of the following statement is correct?

A. When both the variables X and Y are measured on an interval or ratio scale, Karl Pearson's coefficient of correlation is most appropriate

B. The probable error of coefficient of correlation is $$\frac{{\sigma p}}{{\sqrt n }}$$

C. If the sign of two regression coefficient (Y on X) and (X on Y) is negative, the sign of correlation coefficient is positive

D. If one of the regression coefficient is greater than one, the other regression coefficient must also be greater than one

Answer: Option A