The answer is B. Can you help me solve the problem all the way through?

6. You invest $200 in a risky asset with an expected rate of return of 15% and a standard deviation of 15% and a T bill with a rate of return of 5%. A portfolio that has an expected outcome of $240 is formed by a. borrowing $50 at the risk-free rate and investing the total amount in the risky asset. b. borrowing $100 at the risk-free rate and investing the total amount in the risky asset. c. investing S50 in the risky asset and the rest in the riskless asset. d. investing S100 in the risky asset and the rest in the riskless asset