Iceland is slowly growing and very active because it sits on top of the . A. African Plate
B. Ring of Fire
C. Mid-Atlantic Ridge
D. Pacific Plate

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."

answer; ///(3) three parts;

answeranglican church;

answerhand and arm extended upward;