问题如下：
Relative to Approach 1 of gaining passive exposure, an advantage of Approach 2 is that it:
选项：
A. minimizes tracking error.
B. requires less risk
analysis.
C. is more appropriate for
socially responsible investors.
解释：
C is correct.
Enhanced indexing is especially useful for investors who consider environmental, social or other factors when selecting a fixed-income portfolio. Environmental, social, and corporate governance (ESG) investing, also called socially responsible investing, refers to the explicit inclusion or exclusion of some sectors, which is more appropriate for an enhanced index strategy relative to a full index replication strategy. In particular, approach 2 may be customized to reflect client preferences.
请问b为什么不对，谢谢