Answer: A) to forewarn that there is no guarantee that people are capable of ending war is the correct answer.
Step-by-step explanation:
"The Sinews of Peace", also known as "Iron Courtain Speech" is considered as Winston Churchill's most important speech. He delivered it on March 5, 1946, as Leader of the Opposition. According to Robert Rhodes James, the speech is considered by Russians as the beginning of the Cold War.
Due to the context in Europe and across the world, where tension was increasing between two extreme poles after World War II, the phrase is used by the speaker to indicate that even though past events might not bring hope, humans have the ability to stop war.