The main reason for the USA’s military intervention in the Korean war was that of containment. The American aims was to work with its allies to contain the spread of soviet and communist Chinese power using political, economic and if necessary military pressures. Any failure of containment was potentially disastrous. According to the USA the loss of SK might well lead to a chain reaction leading to the loss of much of the rest of Asia, including Japan.
Athens is known as the birthplace of democracy. But it was a long path to get there. And this democracy didn't exactly function like any nation you think of today. Most people today think of democracy as an inherently good thing
I believe the correct answer is D. Hope this helped!
-Twix