The disburses funds to state and local governments for participation in national programs. A.
local government
B.
state government
C.
national government
D.
all of the above

C. national government

[ I am not sure though]

the answer is d. amendments.

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."