They had to ______ the meeting because the organizers didn’t prepare the hall well, where people can share their opinions and hold discussions. 

A．put forward

B．put out

C．put up

D．put off

根据我国《刑事诉讼法》以及相关司法解释的规定，下列说法正确的是：

A．被告人毕某可以以审判员蔡某是本案自诉人李某的诉讼代理人的堂兄为由，向法院申请蔡某回避
B．犯罪嫌疑人蒋某可以以本案证人王某曾担任过本案的侦查人员为由，申请王某回避
C．被告人黎某可以以本案审判员孟某在本案第一审程序中担任过书记员为由，申请孟某在本案第二审程序中回避
D．被告人欧某可以以本案陪审员任某是被害人任五一的堂兄为由，申请任某回避