Final answer:
The words 'proud' and 'committed' from John F. Kennedy's inaugural address support the speaker's optimistic tone by conveying a sense of honor and steadfast dedication. Therefore, the correct answer is option A. proud, committed
Step-by-step explanation:
The words from the passage of John F. Kennedy's inaugural address that support the speaker's optimistic tone are 'proud' and 'committed'. These words convey a sense of dignity and determination, reflecting the positive outlook of Kennedy's vision for America and its role in the world. The use of 'proud' indicates a sense of satisfaction and honor in America's heritage, while 'committed' demonstrates a steadfast dedication to uphold and advance human rights both domestically and globally.