TOEFL Reading: ETS-TOEFL阅读机经 - K3D1DYDQL0Y58576L$

Which of the following can be inferred from paragraph 1 about the Incan system of rulers? A. It was first introduced when the expansion of the Incan empire began. B. It required that multi-rulers share a particular title at the same time. C. It was sometimes confusing to the Incan informants of the Spaniards. D. It was unlike the system used in sixteenth century Spain.