B 是正确的.
这是属于前否后肯的反义疑问句.可是，带有宾语从句的句子，反义疑问句肯定或否定不是和宾语从句相反么在“I think +宾语从句”中，肯定还是否定看主句，反义疑问句的主语看从句。例如：I think he will come here on time,【won't he 】? I think don'the will come here on time,【willhe 】?