C为什么不对

问题如下：

According to the recommended procedures for compliance with the Standard relating to responsibilities of supervisors, a firm's code of ethics should:

选项：

A.Only be written in plain language.

B.Only be integrated in the firm's compliance procedures.

C.Both be written in plain language and be integrated in the firm's compliance procedures.

解释：

Option A is correct because according to recommended procedures for compliance with Standard IV (C), Responsibilities of Supervisors, Stand-alone codes of ethics should be written in plain language and should address general fiduciary concepts.