没太理解为什么B错了，解释也没太看明白，请老师解释下，谢谢！

Which of the following statements would least likely describe an appropriate use of a security market index? 选项： A. Reflections of market sentiment. B. Comparing a value manager's performance against a broad market index. C. Proxies for measuring of beta and risk-adjusted return. 解释： B is correct. The index stocks are those that the manager actually choose from, which means that portfolio securities will be selected from value stocks. So a value manager should be compared against a value index, not a broad market index.