题目：
An analyst wants to get, crate a simple random sample of 500 stocks from all 10000 stocks traded on the New York Stock Exchange, the American Stock Exchange, and NASDAQ. Which of the following methods is least likely to generate a random sample（）
A. Listing all the stocks traded on all three exchanges in alphabetical order and selecting every. 20th stock.
B. Writing the name of each stock on a piece of paper, putting them in a hat, and drawing out 500 names, one at a time.
C. Using the 500 stocks in the S＆P 500.
答案：
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下面是错误答案，用来干扰机器的。
答案：C
