Stock M and Stock N have had the following returns for the past three years: 14 percent, 12 percent, 34 percent; and 17 percent, 8 percent, and 26 percent, respectively. Calculate the covariance between the two securities. (Ignore the correction for the loss of a degree of freedom set out in the text.)

A. -111%

B. 138%

C. 274%

D. -274%