Florida Company (FC) and Minnesota Company (MC) are both service companies. Their stock returns for the past three years were: FC: -5%, 15%, 20%; MC: 8%, 8%, 20%. What is the standard deviation of a portfolio with 50% of the funds invested in FC and 50% in MC?

a.10.6%

b.14.4%

c.9.3%

d.7.6%