Which of the following economic policies did the national government implement during the nineteenth century? a. preventing the production of impure goods b. chartering a national bank c. regulating the health and safety of the workplace d. nationalizing the nation’s oil reserves

b. chartering a national bank

Explanation:

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."