问题如下图：
选项：
A. 
B. 
C. 
解释：
老师，我能理解选择A，但是C选项上课的时候就不是很理解，为什么资产配置有效会使得交易成本低呢？配置有效不就是分散化嘛，那不就会买很多次卖很多次不是会增加交易成本吗？
NO.PZ2015122801000009 问题如下 Whiof the following is least likely to a characteristic of a well-functioning financisystem? A.e to the informationefficiency, market prices refleall current information. B.The financisystem is informationally efficient, anthe security prices reato new information quickly. C.A market cperform low trang costs e to the operationally efficiency. A is correct.informationally efficient market is characterizereflecting all available information about the value of the securities.A是正确的。本题考察的是功能健全市场的特点。一个功能健全的市场，价格应该反映所有过去和当下的可得信息。而A只说反映当下的信息，所以不全面。 本题问题描述的是最不可能，答案回答的是最可能，错误。
NO.PZ2015122801000009 问题如下 Whiof the following is least likely to a characteristic of a well-functioning financisystem? A.e to the informationefficiency, market prices refleall current information. B.The financisystem is informationally efficient, anthe security prices reato new information quickly. C.A market cperform low trang costs e to the operationally efficiency. A is correct.informationally efficient market is characterizereflecting all available information about the value of the securities.A是正确的。本题考察的是功能健全市场的特点。一个功能健全的市场，价格应该反映所有过去和当下的可得信息。而A只说反映当下的信息，所以不全面。 如上
NO.PZ2015122801000009 问题如下 Whiof the following is least likely to a characteristic of a well-functioning financisystem? A.e to the informationefficiency, market prices refleall current information. B.The financisystem is informationally efficient, anthe security prices reato new information quickly. C.A market cperform low trang costs e to the operationally efficiency. A is correct.informationally efficient market is characterizereflecting all available information about the value of the securities.A是正确的。本题考察的是功能健全市场的特点。一个功能健全的市场，价格应该反映所有过去和当下的可得信息。而A只说反映当下的信息，所以不全面。 B说股价反应最新的信息，可是实际上应该是全部产品都反应最新的信息不是么。那么这么说B是不是也是不全面的呢。。。。。
current information单单指当前市场信息吗？从中文理解，现在市场信息难道不是包括历史信息和当下信息吗？还是说英文里面current就不包括过去信息
请问a为何不对？谢谢老师
