When Governor Faubus ordered the Arkansas National Guard to surround Central High School to keep the nine students from entering the school, President Eisenhower ordered the 101st Airborne Division into Little Rock to insure the safety of the "Little Rock Nine" and that the rulings of the Supreme Court were upheld.
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.