The way the guests---in the hotel influnced their evaluation

B。were treated 我是第一个回答的,但看到下边的都选A,所以我要解释一下the way 后面的the guests _were treated_ in the hotel 是定语从句,省略了引导词。而influenced是主句的谓语既然是个从句就应该有主语和谓语又是被动,所以选B,没错的。