20. You are constructing a scatter plot of excess returns for stock A versus the market index. If the correlation coefficient between stock A and the index is -1, you will find that the points of the scatter diagram and the line of best fit has a a) all fall on the line of best fit; positive slope b) all fall on the line of best fit; negative slope c) are widely scattered around the line; positive slope d) are widely scattered around the line; negative slope