为什么不选a 啊

问题如下：

When a client asks her how she makes investment decisions, Petra Vogler, CFA, tells the client she uses mosaic theory. According to Vogler, the theory involves analyzing public and nonmaterial nonpublic information, including the evaluation of statements made to her by company insiders in one-on-one meetings in which management discusses new earnings projections not known to the public. Vogler also gathers general industry information from industry experts she has contacted. Vogler most likely violates the CFA Institute Standards of Professional Conduct because of her use of:

选项：

A.nonmaterial nonpublic information. B.one-on-one meeting information. C.industry expert information.

解释：

A violation of Standard II(A): Material Nonpublic Information is likely to occur when using information that is selectively disclosed by corporations to a small group of investors, analysts, or other market participants. Earnings estimates given in a one-on-one meeting would likely be considered material and nonpublic information. Information made available to analysts remains nonpublic until it is made available to investors in general. Under the mosaic theory, it is acceptable to use information from industry contacts as long as the analyst uses appropriate methods to arrive at her conclusions. Additionally, it is acceptable to use nonmaterial nonpublic information in her analysis; this use is not a violation of Standard II(A): Material Nonpublic Information.