Which of the Following Statements About the Crystal Palace Is

Which of the following statements about the Crystal Palace is most accurate?

A) It was constructed from a series of "prefabricated" components and included a large amount of glass.
B) Its iron frame made it essentially fireproof and almost indestructible.
C) It was a permanent structure that had to be demolished once the World's Fair for which it was built ended.
D) It was unusually expensive and slow to build.