What event marked the beginning of the cuban missile crisis?

It is A. John F. Kennedy ordered a blockade on Cuba to prevent any other missiles. The Soviet Union saw this as an act of war.

The correct answer is A.

On October 15, 1962, Air Force Pilot Richard Heyser  was flying a spy plane over Cuba. He took pictures of Russian medium-range missiles. Soviet leader Nikita Khrushchev had asked Cuba President Fidel Castro if he could put them there in May.

The Cuban Missile Crisis was a 13-day confrontation between the USA and the Soviet Union. The US deployed ballistic missiles in Italy and in Turkey and the Soviet Union responded with placing them in Cuba. The missiles in Cuba were seen as a direct treat to the U.S. security.

This confrontation is often considered to be the closest the Cold War came to escalating into a full-scale nuclear war.

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.