Read the passage. Philadelphia was an important center of activity during the period leading up to and at the time of the American Revolution. It was there in Independence Hall that the Declaration of Independence, establishing the United States as an independent nation, was written and signed. Today, visitors can walk down Philadelphia’s cobblestone streets and visit historic sights. Independence Hall, the Liberty Bell, and the home of Betsy Ross are within walking distance for tourists and history enthusiasts. All of these features make Philadelphia the best tourist attraction in the nation. In which sentence is the author’s viewpoint most evident?
 
A. Today, visitors can walk down Philadelphia’s cobblestone streets and visit historic sights.
 
B. Independence Hall, the Liberty Bell, and the home of Betsy Ross are within walking distance for tourists and history enthusiasts.
 
C. It was there in Independence Hall that the Declaration of Independence, establishing the United States as an independent nation, was written and signed.
 
D. All of these features make Philadelphia the best tourist attraction in the nation.