10. A portfolio is composed of two stocks, A and B. Stock A has a standard deviation of return of 23%, while stock B has a standard deviation of return of 17%. Stock A comprises 70% of the portfolio, while stock B comprises 30% of the portfolio. If the variance of return on the portfolio is 0.040, the correlation coefficient between the returns on A and B is A. 0.699. B. 0.489. C. 0.210. D. 0.119. E. None of the Above