I really don't know _____.Could you tell me?（个人认为是A,但总觉得B好像也是对的）A when is the meeting B when the meeting is C the meeting when is Dthe meeting is 一定得100％100正确!我是不太确定嘛,）

I really don't know _____.Could you tell me?（个人认为是A,但总觉得B好像也是对的）
A when is the meeting B when the meeting is C the meeting when is Dthe meeting is 一定得100％100正确!我是不太确定嘛,）

B when the meeting is是对的,因为要用陈述语序.
祝好!