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　　习题：
　　Exercise：
　　Michael Overton, FRM, is using Monte Carlo simulation to estimate price paths. Under the assumption that stock prices follow geometric Brownian motion (GBM), he is trying to determine the next day’s portfolio value. The portfolio value is currently $500,000, and the mean expected return is 0 with an anticipated standard deviation of 15% over the next 200 days. Assuming the first random draw from a normal distribution is equal to -0.1050, what is the simulated price of the portfolio at the end of the first day?
　　A.     $481,526.
　　B.     $489,733.
　　C.     $497,621.
　　D.     $499,443.