The following portfolios are being considered for investment. During the period under consideration, the risk-free rate (RFR) is 4% and market return is 12%. The average return(R), Beta (B), and standard deviation () of portfolios A, B, C, and D are as follows: Port A, R=15%, B=1.2, =25%; Port B, R=18%, B=1.5, =35%; Port C, R=10%, B=0.9, =19%; and, Port D, R=12%, B=1.0, =22%. Which portfolio has the highest return (reward) to total risk ratio?