问题如下：
The Elmer fund’s management strategy is:
选项：
A.active.
B.passive.
C.blended.
解释：
B is correct. The fund is managed assuming that the market is efficient, and investments are selected to mimic an index. Compared with active strategies, passive strategies generally have lower turnover and generate a higher percentage of long-term gains. An index fund that replicates its benchmark can have minimal rebalancing.
請問這題有沒有可能選blended? 雖然我選對了，但中間有疑惑。因為他說selectively investment tracking S&P500。謝謝老師。
，这句话说的组合跟踪的是SP500指数即SP500是其benchmark。