Tone is the author's attitude toward the speech. Since we know that Dr. King was the author and presenter of the speech, this was one of inspiration, seriousness, hope, and encouraging. This is not to be confused with mood. Mood is your feelings from the text. So, while the tone may be one of hope, to say it was 'hopeful' would be a mood (if that is indeed what you are feeling when hearing it.)
Fun dance. Its two synonyms
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Based on brief stories used to call on the readers feelings
Answer: The mayor commemorates and gives praise to those who were killed while building the bridge.
Explanation:
The option that best summarizes the central idea of this excerpt is option B "The mayor commemorates and gives praise to those who were killed while building the bridge".
This can be seen in the excerpt when the Mayor of the city of Brooklyn said they should recall with kindness the work of the people who contributed to the building of the bridge but had died.
Therefore, the correct option is B.