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: In the late 1960s, Grinder returned to college to study linguistics and received his Ph.D. from the University of California, San Diego in 1971. His dissertation, titled On Deletion Phenomena in English, was published by Mouton in 1976. In the early 1970s, Grinder worked in George A. Miller's laboratory at Rockefeller University. After receiving _his_ Ph.D., Grinder took a full-time position as an assistant professor in the linguistics faculty at the University of California, Santa Cruz (UCSC). <sep>, Pronoun: his <sep>, A: George A. Miller <sep>, B: Grinder

B