Which winner didn't agree with the punishments given in the Treaty of
Versailles? Why?

In the end the Allies agreed that they would punish Germany and attempt to weaken that nation so much that it wouldn't pose a future threat.

Explanation:

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."