A fund manager recently received a report on the performance of his portfolio over the last year. According to the report, the portfolio return is 9.3%, with a standard deviation of 13.5%, and a beta of 0.83. The risk-free rate is 3.2%, the semi-standard deviation of the portfolio is 8.4%, and the tracking error of the portfolio to the benchmark index is 2.8%. What is the difference between the value of the fund's Sortino Ratio (computed relative to the risk-free rate) and its Sharpe Ratio?
　　A. 0.274
　　B. 1.727
　　C. 0.653
　　D. -0.378
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