SAT US History Practice Question

It had been, to say the least, an interesting and chal lenging situation. The two most powerful nations of the world had squared off against each other, each with its finger on the button. The speaker of the above quotation probably is referring to which of the following?

1. A.The Battle of Gettysburg
2. B.The Gulf of Tonkin affair
3. C.The Cuban missile crisis
4. D.The Congress of Versailles
5. E.The fall of Saigon