Answer:
D. to work towards keeping world peace.
Answer:
B. Set up a blockade of Berlin
Explanation:
Soviet Union block the land, railway and other canals that led to West Berlin during the world war II.
Liberty generally allows people to fulfill their goals and personal wishes: this means that there is nothing in the way of people to achieve their goals.
One prize that is connected to liberty is safety: personal liberty applies to everyone, so it also means that other people might be less restrained from hurting us.