The Truman Doctrine was the first and clearest exercise of the policy of containment.
I hope this helps.
No, it is false that when you officially join a political party, you are making a lifelong commitment, since you can change your party affiliation at any time. In fact, you don't have to join any party at all.
"One day Michael came in complaining about a speed bump on the highway. I wonder who he ran over then."
-Jim "Big Tuna" Halpert
Im pretty sure the only answer it could be is C.