Which selection below identifies the great impact Brown v. Board of Education had on the educational system of the United States? Select one:
A. ending segregation
B. allowing students of all races to attend school together
C. ending black-only and white-only schools
D. all of the above

The quote below is an excerpt from the charter of the united nations: "the purposes of the united nations are: to maintain international peace and security, and to that end: to take effective collective measures for the prevention and removal of threats to the peace, and for the suppression of acts of aggression or other breaches of the peace, and to bring about by peaceful means, and in conformity with the principles of justice and international law, adjustment or settlement of international disputes or situations which might lead to a breach of the peace . " source:this section implies that the united nations is prepared to do what to keep world peace?