GMAT Sentence Correction (SC) | World War II taught the United States the folly of punishing a vanquis

Source Nova GMAT

World War II taught the United States the folly of punishing a vanquished aggressor; soafter the war, they enacted the Marshall Plan to rebuild Germany.

(A) after the war, they enacted the Marshall Plan to rebuild Germany.
(B) after the war, the Marshall Plan was enacted to rebuild Germany.
(C) after the war, the Marshall Plan was enacted by the United States to rebuild Germany.
(D) after the war, the United States enacted the Marshall Plan to rebuild Germany.
(E) after the
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