Answer is C but can you explain why with steps

20) You are considering investing $2,100 in a complete portfolio. The complete portfolio is composed of Treasury bills that pay 5% and a risky portfolio, P, constructed with two risky securities, X and Y. The optimal weights of X and Y in P are 75% and 25% respectively. X las an expected rate of return of 12%, and Y has an expected rate of return of 9%. To form a complete portfolio with an expected rate of return of 8%, you should invest approximately in the risky portfolio. This will mean you will also invest approximately and of your complete portfolio in security X and Y, respectively. A) 0%,75%,25% B) 50%,38%,13% C) 48%,36%,12% D) 21%,63%,16%