The initial growth of Pan-African sentiments was a reaction to which of these? O A. the suppression of African culture and development through colonialism
B. the consolidation of power in the hands of a few autocratic African leaders
C. the economic hardships caused by the end of colonial African administrations
OD. the economic power wielded by the Organization of the Petroleum Exporting Countries

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; (trauma);

answer; not notated (at least, not in the traditional sense) and includes many improvised sections and solos;