Congress initiates the formal constitutional amendment process by . A.
a two-thirds majority vote of each house
B.
a simple majority vote of each house
C.
a unanimous vote of each house
D.
Congress cannot initiate the constitutional amendment process

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."

its tr3way you already know