The returns for the DJIA stock market index during the first 6 months of year T (January to June) are as follows:

-3.6; 3.2; 6.13;1.48;-8.09; and -6.24

Likewise, the returns for the Barclays Bond index during the same period are as follows:

1.48; 0.50; -0.95; 1.15; 1.81; and 1.56

Calculate the correlation coefficient, r, between these two indices during the first half of year T.

a) -0.93

b) -0.53

c) -0.746

d) -0.21