The political leaders' focus on national security was intensified by the outbreak of World War II.
What prompted World War II to come out?
There were manifold essential causes of World War II. The worldwide economic downturn, the consequence of the Treaty of Versailles after WWI, the failure of appeasement.
The growth of militarism in Germany and Japan, and the League of Nations' nonaccomplishment are also the important causes that outbreak the WWII. The onset of World War II heightened the political leaders' attention on national security.
Therefore, option B is correct.
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