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c. Whereas the successful prosecution of the war requires necessary protection against dangerous Japanese spies and against their sabotage to vulnerable national-defense material, national-defense premises, and national-defense utilities. . . .

Explanation:

Subjective refers to something based on or influenced by personal feelings, tastes or opinions.  As a consequence, since the excerpt directs attention to the Japanese-American conflict and incarceration, it is suitable to add explict personal viewpoints as regards how Americans could protect from Japanese spies, who could vandalize American defense systems.