The Performance Fund had returns of 19% over the evaluation period and the benchmark portfolio yielded a return of 17% over the same period. Over the evaluation period, the standard deviation of returns from the fund was 23% and the standard deviation of returns from the benchmark portfolio was 21%. Assuming a risk free rate of return of 8%, which of the following is the calculation of the sharpe index of performance over the evaluation period?

A. 0.3913 B .0.4286 C. 0.4783 D. 0.5238