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老师，可以麻烦讲一下这题为什么选B吗？是 mock里面的，我没看明白解析。If a call option is underpriced relative to the binomial model, investors can earn a return in excess of the risk-free rate by buying the call and simultaneously:A.investing the present value of the strike price at the risk-free rate.B.selling short the underlying and investing the proceeds at the risk-free rate.C.buying the underlying and funding the transaction by borrowing at the risk-free rate.按照我的理解，现在这个call是被低估，那么应该买入它，所以选C啊
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