The American attitude shifted in favor of rights for Native Americans. This is based on "Polls showed that Americans believed in rights for Native Americans". Why it's not A is because it wasn't the polling that contributed to the act, but what the polls showed which is C.
....I think in 1897.. hope this helps'
United States President Herbert Hoover has a plan to aid the country during the Great Depression by getting most the unemployed people back to work, rather than directly giving them a relief. He also tried new acts, such as Glass-Steagall's Act and Emergency Relief and Construction Act, to stimulate the US' economy.
The early civilization with the least developed technology was A. Mesoamerican.