The correct answer is C. Some things made him think that the book had not been written by Goldstein but by the Party, such as: * O'Brien mentions Syme's work but not his name it seems a sign that he and O'Brien are accomplices in the crime of weighing. * Winston discovers that O'Brien is a member of the Party and not a member of the Brotherhood and has betrayed him. * Winston asks O'Brien what is room 101? O'Brien replies that Winston already knows what is in room 101. WiInston feels that the book was not written by Goldstein who is an enemy of the town and a traitor.