What Was the International Response When North Korea Attacked South

What was the international response when North Korea attacked South Korea?

A) South Korean forces repulsed the invaders early on, making international intervention unnecessary.
B) Working with Truman, the United Nations authorized military intervention against the aggressors.
C) Truman persuaded Congress to declare war without the backing of the United Nations.
D) Stalin convinced North Korea to end the invasion because the Soviets lacked nuclear weapons.
E) The Soviets used their Security Council veto to prevent United Nations action.