Asimilarity between english colonies and the spanish missions in north america during the 1500s and 1600s was a) the creation of new industries. b) the bringing of unfamiliar diseases to american indians. c) the enslavement of american indians. d) the creation of permanent european settlements.

its c i google it wish u luck

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."