Why do opportunity costs primarily differ among nations? a. nations have different endowments of land, labor skills, capital, and technology. b. work-leisure preferences vary considerably from one nation to another. c. nations employ different currencies. d. nations have different political institutions?

for (a) a tragedy was considered a main greek drama and it influenced alot of others. for (b) the actors in greek theater were named as aeschylus, sophocles, and euripides and sometimes playwrites. for (e) in a semi-circular theater called the "orchestra.". we'll the question was explain where the namer actors originated.

hope this : d

the language dates from the contacts of arabian traders with the inhabitants of the east coast of africa over many centuries. under arab influence, swahili originated as a lingua franca used by several closely related bantu-speaking tribal groups.