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: On the 30th October 1889 Stephenson sustained a defeat by John McLean (rower), who beat him by three. `` lengths, after a good race, over the same course, in 21min 53sec. For this match Stephenson was backed by Mr Warby, of Sydney, who was _his_ chief supporter for a match for the Championship of New Zealand. <sep>, Pronoun: his <sep>, A: Stephenson <sep>, B: Warby

A