Encouraging free trade between countries and helping countries negotiate trade conflicts are the two most important jobs of the . A.
European Union
B.
NAFTA
C.
United Nations
D.
World Trade Organization

Please select the best answer from the choices provided

A
B
C
D

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."