You will be given a definition of a task first, then some input of the task.
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.

Louis Althusser (1918--1990) and his colleagues, prominently including *tienne Balibar, reworked Marxism using insights from structuralism, against the so-called ``humanist'' trend in Sartrean and Western Marxisms. Althusser offered an influential new reading of Marx's work, describing an ``epistemological break'' between the young, Hegelian Marx and the late Marx of Das Kapital. With _his_ focus on the economic level and theory, Althusser came into conflict with social historians, such as E.P. Thompson. <sep>, Pronoun: his <sep>, A: Marx <sep>, B: Althusser
Output:
B