In the U. S. during the Jim Crow era (1880-1967) people legally classified as black chose to pass as white to increase chances of upward mobility. The choice to pass was dependent on the person possessing physical characteristics associated with white. In this sense the choice depended on:

city commissioner and director of the cia.

hello again!

a is your answer!

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."