This is an excerpt from an eighth-grade history textbook: Over 27 million people visited the 1893 Columbian Exposition in Chicago, at a time when the total U. S. population was only 65 million. People didn't just come from all over the United States; they came from all over the world to see what this young nation was about. Which statement best represents the main idea of this source? A. The 1893 Columbian Exposition was very popular, B. The 1893 Columbian Exposition was in Chicago. C. Over 27 million people visited the Columbian Exposition. D. The U. S. population in 1893 was 65 million.