¿Tienes un sello? No. No tengo ni un sello, ni un sobre.
Explanation:
¿Tienes un sello? No. No tengo ni un sello, ni un sobre. In this sentence the "ni" expresses what in English is expressed by "nor". The translation would be: Do you have a stamp? No. I don't have a stamp nor an envelope. In the example given, the first "ni" could be omitted and the phrase would still be correct: "¿Tienes un sello? No. No tengo un sello ni un sobre".
Explanation: the countries on b are all the ones on the inca empire when the conquistadors came they conquire the inca empire that was on those countries
