premise: A detective is trying to determine the order in which a criminal recruited seven accomplices—Peters, Quinn, Rovero, Stanton, Tao, Villas, and White. In addition to discovering that the suspect recruited the accomplices one at a time, the detective has established the following: Stanton was recruited neither immediately before nor immediately after Tao. Quinn was recruited earlier than Rovero. Villas was recruited immediately before White. Peters was recruited fourth. If White was recruited immediately before Quinn, which one of the following must have been recruited sixth?
hypothesis: Rovero