He disagreed with his sister on the subject of Trump vs. Clinton.
The author included the information because it will help the reader to be immersed in the narrator's experience
<h3>What is information?</h3>
Information serves as processed, organized as well as structured data that help the reader to know more about the story.
Therefore, with provided information, the reader can know the mind of the author.
Learn more about information at;
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Papa glanced over toward the crowd, "Why that’s President Arthur himself!" he exclaimed is the sentence from the story best supports the idea that the event was of national importance.
Option B
<h3><u>Explanation: </u></h3>
Chester A. Arthur was the
president of the United States. When a President visits any monument and inaugurates it definitely it becomes the historic moment. It is clear from the story that President Chester A. Arthur has visited the Brooklyn Bridge when it was made, his visit has increased the popularity of the Brooklyn Bridge.
Surely it has become a historic and national event for the country and for the people. From the above line, it is clear that this sentence denoted the historical event of the opening of the Brooklyn Bridge.