问题如下：
Matt considers using a portfolio construction technique to create index-tracking equity portfolios that can minimize tracking error and costs. All constituents in the benchmark are available for trading and liquid and the asset size of the mandate is sufficient. Which of following methods is most likely to be chosen?
选项：
A. Optimization.
B. Full
replication.
C. Stratified
sampling.
解释：
B is correct.
考点：Portfolio construction
解析: 当要追踪的指数中的股票流动性好、交易比较容易，那么只要资产规模足够，基金经理会优先选择完全复制的方法。因为该方法会使得追踪误差最低，而且股票流动性好，也说明完全复制情况下交易费用也不会太高。
这道题，如果benchmark中股票种类多，按照u型图，全部复制应该tracking error大，而且cost也会很高。 不懂为啥选这个