I believe you're looking for the Missouri Compromise.
High productivity growth played a key role in postwar economic growth. The highly skilled and educated labor force, extraordinary savings rates and accompanying levels of investment, and the low growth of Japan's labor force were major factors in the high rate of productivity growth.
I don't know if this is one of your options but it is correct
The early 20th century was an era of business expansion and progressive reform in the United States. ... At home, this meant expanding the right to vote to women and a number of election reforms such as the recall, referendum, and direct election of Senators. Abroad, it meant trying to make the world safe for democracy.
I think it a because i had this same question so i know (a) is the answer
