Earls made a successful return to hosting seated events last year, in a move made possible by new developments in ________ seating.
句意：伯爵们去年成功地重新举办了座谈活动，是可拆卸座椅的新发展使这个活动成为可能。demountable 可分离的。dismembered肢解的。deportable可流放的。demolished被拆毁的。因此选D。