In the fight against child trafficking, the police rescued a boy, in order to identify his hometown, the police conducted an investigation: Insider A said he may be from Sichuan, may also be from Guizhou; Insider B said he can't be from Sichuan; Insider C said he's definitely from Sichuan; insider D said he's not from Guizhou. The police determined that there was only one person whose story could not be trusted.
According to the above ,which of the following options can be identified by the police as the boy's hometown?
Guizhou.