The value of nation's currency increases as the increase

Im guessing the answer is as the GDP increases

Explanation:

you havent provided a pic so that wud be my best guess

answer; i believe that the correct answer is (c) ///

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."