Definition: In this task, you will be presented with a text, a pronoun from the text, and two candidate names. You should determine what the pronoun refers to and classify the answers into A, B, or Neither. A and B here are referring to option A and option B. Position of the pronoun in the text is showed within two "_"s.
Input: Over the years, she provided him with specimens collected in Cornwall as well as those from abroad that came into Britain through Falmouth. She is credited (as ``Miss Warren'') as one of 19 plant specimen collectors to whom Hooker is particularly indebted in the preface to his 1841 Manual of the British Algae. In _his_ history of British seaweeds, Phycologia Britannica, Hooker lists an algae named after her by the botanist Robert Caspary, Schizosiphon Warreniae (now Rivularia biasolettiana). <sep>, Pronoun: his <sep>, A: Hooker <sep>, B: Robert Caspary

A