A portfolio is composed of two stocks, A and B. Stock A has a standard deviation of return of 15%, while stock B has a standard deviation of return of 21%. Stock A comprises 60% of the portfolio, while stock B comprises 40% of the portfolio. If the variance of return on the portfolio is 0.030, the correlation coefficient between the returns on A and B is

a) 0.982

b) 0.589

c) 0.393

d) 0.206

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