Which branch of government holds the power of the purse

Congress or the legislative branch has the power to collect taxes (power of the purse).

In the U.S., Congress, or the Legislative branch has the most powers dealing with finances.

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."

money is the anwser i think