New York, Los Angeles, Chicago, Houston, and Philadelphia are the five most populous cities in the United States. In each case, several tall buildings can be found in their city centers. The tallest buildings in New York, Los Angeles, Chicago, and Houston are all more than 1,000 feet tall. Therefore, Philadelphia must also have buildings that are more than 1,000 feet tall. Which of the following entities, if any, function as secondary analogues in above Passage?

a. Los Angeles
b. Houston
c. Chicago
d. Philadelphia
e. Buildings more than 1,000 feet tall
f. Tall buildings in the city center