问一道题：NO.PZ2019012201000017 [ CFA III ]

NO.PZ2019012201000017 问题如下 When tracking inx with a large number of constituents anthe assets manageis low, a relatively straightforwarantechnically simple methocuseto buila passive portfolio threquires fewer invisecurities ththe inx. The portfolio construction methooutlineis most likely: optimization. full replication. stratifiesampling. C is correct. 考点：Portfolio construction 解析: 当要追踪的指数包含的成分股数量很多，且管理的资产水平相对较少时，最常用的是分层抽样方法。 老师好，想问一下full replication和optimization谁的cost更大？

NO.PZ2019012201000017

    请问如何排除A？题目中提到technically，感觉更像是描述计量方法。