Inca citizens labored for the ruler on the myriad roads, crop terraces, irrigation canals, temples, or fortresses. how were they paid for their work?
a. gold and silver
b. copper and iron ore
c. clothing and food
d. emeralds and jewels

I think the correct answer from the choices listed above is option C. Each subject of the empire paid taxes by laboring on the myriad roads, crop terraces, irrigation canals, temples, or fortresses. In return, rulers paid their laborers in clothing and food. 

The correct answer is:   [b]:   "has no atmosphere" .