In an experiment, a researcher finds that people tend to notice and remember information that is vivid and relevant to their own lives. this researcher is taking the perspective.

stewards ice box was the purchase of alaska from russia and it was called that because people thought it was not a good idea to purchase alaska

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."