If risk is defined as a potential for unexpected loss, which factors contribute to the risk of a long straddle position?
　　A.Delta, vega, rho
　　B.Vega, rho
　　C.Delta, vega, gamma, rho
　　D.Delta, vega, gamma, theta, rho
　　答案：B
　　答案解析：
　　A
　　long straddle is delta-neutral and has positive gamma, thus it is only
　　exposed to vega risk and rho risk. Theta is not a risk factor.
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