45. When Peter finished telling the story of the accident, one look at the ______ faces of his listeners made him realize that they did not believe him.
(A) incredible
(B) incredulous
(C) discreditable
(D) accredited

當彼得完成意外發生的故事時，看一眼他的聽眾的 ___ 面孔使他意識到他們不相信他。