Logic 1014: a bug puzzle?

HardyNiborUID: 3461489

14. Neither the Sami nor the Kephrian delegations attended the international conference. Beforehand. the delegations of Daqua and Kephria. allies whose governments had grievances against Tessia. officially announced that one or both of the two would stay away if the Tessian delegation attended the conference. In response, the Sami delegation officially announced that it would definitely attend if both the Daquan and Kephrian delegations stayed away.
If the statements given are all true and all the delegations adhered to their official announcements. it must also be true that the
(A) Daquan delegation attended the conference
(B) Daquan delegation did not attend the conference
(C) Sami government had no grievance against Tessia
(D) Tessian delegation did not attend the conference
(E) Tessian delegation made no official announcement regarding its attendance at the conference

T要来了DK就至少一个不来，DK要都不来S就一定来，结果SK都没来，其他两家未知。

答案给的E。官方声明来或不来就一定这么做么？官方声明了DK就肯定信了么？腹黑的S也会因此连动？

去他妈的绝逼是BUG题不服来辩