In Part A, the argument that President John F. Kennedy makes in his "Ich bin ein Berliner" speech is that Democracy is morally superior to communism. Kennedy's speech emphasizes the value of freedom and democracy while condemning the oppressive nature of communist regimes, particularly in the context of the Berlin Wall and the division of East and West Berlin.
In Part B, the answer choice that presents the most logical reasoning based on Part A is: Democracy is morally superior to communism. This reasoning is supported by Kennedy’s overarching message in the speech, which underscores the ideals of liberty and human rights versus the restrictions imposed by totalitarian communist systems.