Advantages that corporations brought to the United States included: (1) decreased unemployment, (2) lower prices, (3) reduced competition, (4) quality goods, (5) a larger variety of merchandise, (6) increased production

1,2,4,5,6

Explanation:

A corporation is a legal entity created by individuals, stockholders, or shareholders, with the purpose of operating for profit. Since it's a large firm, it helpes to increase employment rate, make quality goods available for consumers at cheaper rate in different varieties at an increased production circulating the population.

no because it could make the world a terrible place to live in.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."