Read the selection from the section "Art And Architecture."
Modern scientists believe that the use of this ash is the reason that structures like the Colosseum
still stand today. Roman underwater structures proved to be even sturdier. Seawater reacting with
the volcanic ash created crystals that filled in the cracks in the concrete. To make concrete this
durable, modern builders must reinforce it with steel. So today, scientists study Roman concrete,
hoping to match the success of the ancient master builders.
What can be inferred from this selection?
(A) Ancient Romans knew that the Colosseum would stand for thousands of years because of their
concrete.
(B) Modern scientists and builders have realized that steel will never be as durable as Roman concrete.
(C) Romans pumped seawater into Rome in order to strengthen the concrete used in the walls of the
Colosseum.
(D) Studying Roman concrete may help scientists develop similarly strong materials without having to use
steel.