June 5438+October 2007 10, a woman in Taiwan Province Province was poisoned by taking a large dose of vitamin C after eating raw river shrimp. The recipe records that shrimp should not be eaten with tomatoes. A, according to the data, the valence of arsenic decreased in the reaction, and the valence of an element in vitamin C increased, so vitamin C was used as a reducing agent in the reaction, so A was wrong;

B. According to the data, substances containing trivalent arsenic are toxic, and arsenic is an oxide of arsenic, which is toxic, so arsenic contained in arsenic may be trivalent arsenic, so b is correct;

C, shrimp contains pentavalent arsenic, non-toxic, edible, so C is wrong;

D, in the reaction, the valence of arsenic decreases, and the valence of an element in vitamin C increases. In the reaction, vitamin C is used as a reducing agent, so D is wrong;

So choose B.