问题如下图：请帮忙解释一下B选项怎么理解？
选项：
A. 
B. 
C. 
解释：
NO.PZ2018110601000021 问题如下 Which of the following statement regarng factor-baseasset allocation is least appropriate? Factors are typically baseon market premiums ananomalies A common wto construfactors is self-financing investment. Factors are typically fferent from the funmentor structurfactors used in multi-factor mols. C is correct 考点：factor-based asset allocation 解析：Fama-French三因素模型是典型的factor-baseasset allocation，既包含market premium，又包含size和book-to-market两个基本面因子（funmental factors/ anomalies）。构建这些因子的方法是self-financing investment，或者称作zero llar investment，例如：Size factor return=Small-cstoreturn−Large-cstoreturn。 基础班哪里讲的这部分内容呀？可以截图一下吗？毫无印象
NO.PZ2018110601000021问题如下 Which of the following statement regarng factor-baseasset allocation is least appropriate? Factors are typically baseon market premiums ananomalies A common wto construfactors is self-financing investment. Factors are typically fferent from the funmentor structurfactors used in multi-factor mols. C is correct 考点：factor-based asset allocation 解析：Fama-French三因素模型是典型的factor-baseasset allocation，既包含market premium，又包含size和book-to-market两个基本面因子（funmental factors/ anomalies）。构建这些因子的方法是self-financing investment，或者称作zero llar investment，例如：Size factor return=Small-cstoreturn−Large-cstoreturn。 c为什么不对，麻烦下
NO.PZ2018110601000021 问题如下 Which of the following statement regarng factor-baseasset allocation is least appropriate? Factors are typically baseon market premiums ananomalies A common wto construfactors is self-financing investment. Factors are typically fferent from the funmentor structurfactors used in multi-factor mols. C is correct 考点：factor-based asset allocation 解析：Fama-French三因素模型是典型的factor-baseasset allocation，既包含market premium，又包含size和book-to-market两个基本面因子（funmental factors/ anomalies）。构建这些因子的方法是self-financing investment，或者称作zero llar investment，例如：Size factor return=Small-cstoreturn−Large-cstoreturn。 请A B为啥合适
NO.PZ2018110601000021问题如下 Which of the following statement regarng factor-baseasset allocation is least appropriate? Factors are typically baseon market premiums ananomalies A common wto construfactors is self-financing investment. Factors are typically fferent from the funmentor structurfactors used in multi-factor mols. C is correct 考点：factor-based asset allocation 解析：Fama-French三因素模型是典型的factor-baseasset allocation，既包含market premium，又包含size和book-to-market两个基本面因子（funmental factors/ anomalies）。构建这些因子的方法是self-financing investment，或者称作zero llar investment，例如：Size factor return=Small-cstoreturn−Large-cstoreturn。 a劳烦一下 谢谢
NO.PZ2018110601000021 问题如下 Which of the following statement regarng factor-baseasset allocation is least appropriate? Factors are typically baseon market premiums ananomalies A common wto construfactors is self-financing investment. Factors are typically fferent from the funmentor structurfactors used in multi-factor mols. C is correct 考点：factor-based asset allocation 解析：Fama-French三因素模型是典型的factor-baseasset allocation，既包含market premium，又包含size和book-to-market两个基本面因子（funmental factors/ anomalies）。构建这些因子的方法是self-financing investment，或者称作zero llar investment，例如：Size factor return=Small-cstoreturn−Large-cstoreturn。 例如，想要构建size factor，就可以short large-cstock，拿到cash，再用这些钱去long small-cstock，这两个头寸净价值为零同时剥离出了size这个风险因子。为什么同等价值的就剥离了size factor？ 剥离出size这个factor可以看到什么影响？
