Drew can design a risky portfolio based on two risky assets, Origami and Gamiori. Origami has an expected return of 13% and a standard deviation of 20%. Gamiori has an expected return of 6% and a standard deviation of 10%. The correlation coefficient between the returns of Origami and Gamiori is 0.30. The risk-free rate of return is 2%. What is the standard deviation of the optimal risky portfolio?

A. 9.34%

B. 47.78%

C. 12.19%

D. 60.26%