Oklahoma farm restructuring occurred throughout the late 20th century, indicative of the rise of corporate .

The fourth comprises the energy boom and bust of the late twentieth century, along with ... The growth of the non-Indian population grew remarkably. ... In contrast, throughout much of the nineteenth and early twentieth centuries ... War II and postwar recovery, and the dramatic restructuring of the farm economy in the 1950s.

Explanation:

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

silk

indigo  

rice

all the other answers are wrong