Which two American corporations were instrumental in the development of the Savannah River Site nuclear materials processing
center?
DuPont and Westinghouse
DuPont and Lockheed Martin
Honeywell and North American
D)
General Electric and Westinghouse

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; belief perseverance;

answer; which categories of people are most at risk of becoming a criminals;

answer; the above statement is ( false );