A portfolio is comprised of two stocks, A and B. Stock A has a standard deviation of return of 25% while stock B has a standard deviation of return of 5%. Stock A comprises 20% of the portfolio while stock B comprises 80% of the portfolio. If the variance of return on the portfolio is .0080, the correlation coefficient between the returns on A and B is __________.

A. -.975

B. -.025

C. .025

D. .975