I don't think there's an age limit...
The option that most effectively completes the sentence is “allowing world nations freedom of choice, within reason, promotes peace”. According to John Kennedy in his speech delivered at the American University, nations (in this case he refers to the Soviet Union) should not try to impose rules on other nations as this interferes with the process of peace and creates tension.
The correct answer is the Second Option - Pausing the speech and sumerizing periodically
Hope this Helps
A. Kept
B. Keeped
C. Keeping
D. No error
Answer:
A. Kept
Explanation:
FYI: "Have kept" would work as well.