Assume that the return of a risk-free asset is 5%, while the expected return and standard deviation of the risky asset are 15% and 20%, respectively. What percentages of your money must be invested in the risk-free asset and the risky asset, respectively, to form a portfolio with expected return of 10%?

A) 50% and 50%

B) 450% and 55%

C) 60% and 40%

D) 70% and 30%

E) cannot be determined