Studies of levels of poisons in snow were made by a(n) . analyzed
especially
accumulative
environmental
microscopic
particles
industrial
geochemist
exhaust
toxicity

c: in the east might be the correct answer

c- companies fail to take environmental protection into account. i think

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."

was the answer correct?