Thwe answer is 3 i know becuase i had to research it one time hope it helps
Answer:
The Progressive Era (1896–1920)
Explanation:
was a period of widespread social activism and political reform across the United States of America that spanned the 1890s to the 1920s.
The main objectives of the Progressive movement were addressing problems caused by industrialization, urbanization, immigration, and political corruption.
I would go with D. All of the above. Even though I don't know about the Song/Tang Dynasties, I know for sure that they invented those things. So it is D.