题目：
Which of the following statements about portfolio risk is true（）
A. In the absence of perfectly positive correlation, a portfolio will always have lower risk than the average risk of the component assets.
B. In the absence of perfectly positive correlation, a portfolio will always have lower risk than the risk of each of the component assets.
C. In the absence of perfectly negative correlation, a portfolio will always have lower risk than the risk of each of the component assets.
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
