题目：
熊市中，程大叔预期后市股票价格下跌幅度有限，这时对程大叔来说最有利的操作是（）。
A.卖出认沽期权
B.买入认沽期权
C.卖出认购期权
D.利用认沽期权垂直套利
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A, B, C, D
熊市中，程大叔预期后市股票价格下跌幅度有限，这时对程大叔来说最有利的操作是（）。 A
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