C为什么不对？

问题如下：

The APT model is derived from

选项：

A.

a theoretical model of optimal portfolio selection.

B.

an extension of the concept of CAPM.

C.

arbitraging a few known risk factors in the market

D.

investors holding efficient portfolios.

解释：

B is correct..

an extension of the concept of CAPM.

Arbitrage Pricing Theory (APT) is based on the reasoning behind CAPM. It differs in that it is a multi-factor model.

中文解析：

套利定价理论(APT)是基于CAPM的延伸。区别在于APT是多因素模型，CAPM是单因素模型。