The Indus River is the correct answer.
I believe you are referring to the evacuation of Saigon (Fall of Saigon) on April 30, 1975. If so, the correct answer is c. The U.S. evacuated Vietnamese whose lives would be in the greatest danger if they were to be left behind.
The answer is C Linda Brown
One of the most significant results of the Montgomery bus boycott was that the segregation of busses was ended by court order, although white short-term retaliation was brutal.