<span>D) the imposition of a state religion ensured a shared culture</span>
Because they bombed pearl harbor so it was revenge.
The correct answer is Incas. Out of the famous South and Central American tribes, the Zapotec, the Maya, and the Aztecs lived in what is today's Mexico, while the Incas lived further south, mostly in Peru and around that area. Mexico had these three and some more, but these were the most famous, among other things for their monumental buildings that can still be found today.
Although opportunity cost is definitely important, it is hard to put a "price" on the opportunity in many cases, which makes it unmeasurable. This is why economists focus almost exclusively on price.
