Which of the following terms describes the belief that the government should own the nation's major industries? a) socialism b) free enterprise c) democracy d) unionism

unionism is having unions taking care of regulations and industry.

free enterprise is not having the government interfere

Democracy is having the right to vote for things.

the answer is socialism

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."