on april 7 1980, the u. s. imposed an embargo on exports to iran due to the iran hostage crisis. how many days did the hostage crisis last?

sorry but your romanian isn't clear could you just translate to english

explanation:

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."