It is correct that Wang Xizhi of Dongpu was called a "book saint" by later generations.
③ "Yan Liu Jin Gu" refers to the calligraphy of Yan Zhenqing and Liu Gongquan in the Tang Dynasty, which is correct.
4 "Yu Gong Yi Shan" is the masterpiece of Xu Beihong, the master of art, that's right.
② ③ ④ It conforms to the meaning of the question.
So choose B.