What factor contributed to the defeat of the Inca by the Spanish?

A.
the refusal of the Inca to pay a ransom for their emperor

B.
the lack of an Incan army

C.
the refusal of the Incan emperor to cooperate with the Spanish

D.
the appointment of an Incan emperor by Pizarro

C. the refusal of the Incan emperor to cooperate with the Spanish