Answer:
B. Physical aggression against any neighbor.
Step-by-step explanation:
This is one of the ideas that are mentioned in President Roosevelt's address to Congress in 1941 but is not addressed in Dr. King's "Letter from a Birmingham Jail." In this passage, the President talks about the dangers of physical aggression against neighbours. This is because President Roosevelt was talking about the effects of war at an international scale. On the other hand, Dr. King discusses national matters that are less applicable to this idea.