The set of bivariate observation (x1, y1) (x2 y2) …., (xn, yn) are such that all the values are distinct and all the observations fall on a straight line with non-zero slope. Then the possible value of the correlation coefficient between x and y are

• A. 0 and 1 only
• B. 0 and -1 only
• C. 0, 1 and -1
• D. -1 and 1 only