Given the task definition and input, reply with output. 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.

He was promoted by Braxton Bragg to the rank of major and given command of the reserve artillery battalion of the Army of Tennessee, which he led at Chickamauga in September 1863. Robertson was subsequently promoted to lieutenant colonel and reassigned to command the Confederate horse artillery under Joseph Wheeler. _He_participated in the 1864 Atlanta Campaign. <sep>, Pronoun: He <sep>, A: Robertson <sep>, B: Joseph Wheeler
A