Whereas the successful prosecution of the war requires every possible protection against espionage and against sabotage to national-defense material, national-defense premises, and national-defense utilities. .

which revision of the excerpt best adds a subjective tone?

a. whereas the prosecution of the war requires protective measures against espionage and against sabotage to national-defense material, national-defense premises, and national-defense utilities. .

b. whereas the successful prosecution of the war requires every possible protection against espionage and against sabotage from our enemies to national-defense and military materials. .

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. .

d. whereas winning the war requires much protection against espionage and against sabotage to national-defense material, national-defense premises, and national-defense utilities. .

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: The tone of a text is the attitude of the author towards the audience, the subject of the text or the characters. We can say that a text has a subjective tone, when the author expresses his own, partialized opinion in the text. In this case, the revision of the excerpt that has a subjective tone is the one corresponding to option C, because it says "dangerous Japanese spies" and "vulnerable national-defense material" which are both signs of a partialized opinion.

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.

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