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: This led to successful revolts against Cassander's local rulers. In 307 BC, Antigonus's son Demetrius captured Athens and restored its democratic system, which had been suppressed by Alexander. But in 301 BC a coalition of Cassander and the other Hellenistic kings defeated Antigonus at the Battle of Ipsus, ending _his_ challenge. <sep>, Pronoun: his <sep>, A: Demetrius <sep>, B: Alexander

Neither