The Fed processes and keeps track of billions of money transfers every day through the service of A. credit checks
B. card clearance
C. check clearing

answer; john stuart mill's principle of utility is your answer; /// good luck

do all equestions have to be answered

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."