Mum,could you tell please me ____ Dad has gone to London?A.when B.how long C.if D.how oftenWhich one?Why?

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Mum,could you tell please me ____ Dad has gone to London?
A.when B.how long C.if D.how often
Which one?Why?

C,equivalent to whether.
The only thing you need to take care is B which is a wrong answer because you can't use it for a temparary action like go,come.If you want to use it,Fine.But it would be:
Mum,could you please tell me hong long Dad has been to London?
Hope this make sense to you!Cheers.
BTW,I think it should be "could you please tell me..." instead of "could you tell please me."

A. when
gone不是延续性动词,所以b不行
c明显不对,d意思上不对 has gone就是已经去了的状态,不能问:“多么经常去”

C. if
其它短语都不能与 has gone to 连用