Which sentence best completes the diagram? ? --> The U. S. dollar becomes an important global currency.
A. The United States establishes the gold standard.
B. The Great Depression harms the world economy.
C. The United States becomes a developing country,
D. The Bretton Woods system begins.

D. The Bretton Woods system begins.

Explanation:

Just got it right

is there a year set? the question is incomplete

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."