How does paragraph 11 contribute to the development of the main ideas of the passage?

A) It shows that, although the Liberty ships were convenient and
effective for carrying cargo, they were not robust enough to
withstand attacks from the Germans.
B) It demonstrates that Americans contributions to the war effort in
the name of global security outlasted the war itself.
C) It emphasizes that the formation of NATO followed closely on the
heels of World War II.
D) It underscores the reality that global monitoring on the part of the
United States did not cease to be necessary after the end of the
war.