Question

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Explanation:

To determine the tone, we analyze the passage. The speaker (MacArthur) shows pride in American ideals, the nation's role, and the efforts of the people. Phrases like "great pride", "serve my country", and the confident stance on global issues and Asia's progress indicate a proud tone. "Frustrated" (A) is incorrect as there's no frustration shown. "Solemn" (B) is too serious; the tone has pride, not just solemnity. "Motivated" (C) focuses on action, but the tone is about pride in the nation and its path, not just motivation. So "proud" (D) fits.

Answer:

D. proud