题目
What is the risk-neutral probability of an up movement （ ） in a two-step binomial model used to value an two-year American-style put option on a stock with a volatility of 38% when the risk-free rate is 4.0%; i.e., each step is one year?
选项
A.0.411
B.0.459
C.0.503
D.0.548
答案
B
解析
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