Detailed Instructions: 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.
Q: The explanation offered by Muirhead is more prosaic than the fanciful rumours suggested. He examined the clothing left behind in the lighthouse and concluded that James Ducat and Thomas Marshall had gone down to the western landing stage, and that Donald MacArthur (the 'Occasional') had left the lighthouse during heavy rain in _his_ shirt sleeves. <sep>, Pronoun: his <sep>, A: Thomas Marshall <sep>, B: Donald MacArthur
A:
B