Covariance problem I don't get his, government, generated, following

suxiaoxiao

Hey all,

Kenny James, CFA, is calculating the covariance of his large-cap mutual fund returns against the returns generated by intermediate government bonds over the past five years. The following information is provided: (A-a) is the annual return minus the mean return for the large-cap mutual fund; (B-b) is the annual return minus the mean return for the intermediate government bonds):

-------- || (A-a) || (B-b)
Year 1 || -23.4 || 4.2
Year 2 || -13.2 || -1.6
Year 3 || -10.4 || 4.8
Year 4 || 19.7 || -12.2
Year 5 || 27.2 || 4.7

Which of the following is closest to the covariance between the mutual fund and government bonds?

A. -47.9
B. -59.9
C. -239.6

--------ANSWER IS SHOWN BELOW--------

The answer is B, can anyone explain why isn't it A??