What role did the un play in the cuban missile crisis?

Kennedy gave a key warning in his first public speech on the crisis (October 22, 1962): 

It shall be the policy of this nation to regard any nuclear missile launched from Cuba against any nation in the Western Hemisphere as an attack on the United States, requiring a full retaliatory response upon the Soviet Union.

This speech included another key policy: 

To halt this offensive buildup, a strict quarantine on all offensive military equipment under shipment to Cuba is being initiated. All ships of any kind bound for Cuba from whatever nation and port will, if found to contain cargoes of offensive weapons, be turned back. This quarantine will be extended, if needed, to other types of cargo and carriers. We are not at this time, however, denying the necessities of life as the Soviets attempted to do in their Berlin blockade of 1948. 

Kennedy ordered intensified surveillance, and cited cooperation from the foreign ministers of the Organization of American States (OAS). Kennedy "directed the Armed Forces to prepare for any eventualities; and I trust that in the interest of both the Cuban people and the Soviet technicians at the sites, the hazards to all concerned of continuing the threat will be recognized." He called for emergency meetings of the OAS and United Nations Security Council to deal with the matter.

The answer is d.  the north had organized schools, whereas the south had few organized schools.