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 B is because it wasn't the polling that contributed to the act, but what the polls showed which is C.
Because up until that time, the right to vote had not been clearly defined in the constitution.
The 19th Amendment also was not part of the constitution. I sometimes think our forefathers thought women were property.
It is a judge or jury. Think of someone who declared that someone was guilty. They are the convicts.
