Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Sun regained control of Kwangtung in early 1923, again with the help of mercenaries from Yunnan and from the Comintern. Undertaking a reform of the KMT, he established a revolutionary government aimed at unifying China under the KMT. That same year, Sun sent Chiang to spend three months in Moscow studying the Soviet political and military system. During _his_ trip in Russia, Chiang met Leon Trotsky and other Soviet leaders, but quickly came to the conclusion that the Russian model of government was not suitable for China. <sep>, Pronoun: his <sep>, A: Chiang <sep>, B: Leon Trotsky
Student:
A