Is this the reason ______ at the meeting for his carelessness in his work?   [ ]

A. he explained                            

B. what he explained  

C. how he explained                        

D. why he explained

下列关于短期融资券的说法，错误的是( )。

A．发行主体为包括证券公司等在内的企业
B．发行对象为银行间债券市场机构投资者
C．证券公司短期融资券的期限最长不超过91天
D．收益率比央行票据和短期国债低