问题如下：
Which of the following statements about objectives of International Organization of Securities Commissions (IOSCO) is least appropriate?
选项：
A. protect investors
B. ensure the fairness, efficiency, and transparency of the markets
C. reduce non-systemic risk
解释：
C is correct. One of the three objectives of IOSCO is to reduce systematic risk.
为什么C不对呢 我的理解是通过这种规则规避非系统性风险 系统性风险不是不可分散的吗