Read this excerpt from The Great Fire. As the rest of the city went about its business, fireman Dorsey was racing through the streets to the closest signal box, which happened to be at Goll's drugstore. He opened the small door on the box and used his thumb to pull down the lever. Dorsey then headed back to the scene of the fire, not realizing that he'd made a mistake — he had forgotten to pull down the lever four times, a special signal that would have made it a true second alarm. At the Courthouse, Schaffer and Brown would hear Dorsey's alarm, but, assuming it was simply another signal telling them about the original fire, they failed to call out more engines. The fire had now been burning for over an hour, and the wind was increasing in velocity.

Which statement best describes the effect of Dorsey pulling the lever only once?

Schaffer and Brown did not realize there was a second alarm.
More engines were ordered to go to the scene of the fire.
The fire started spreading more quickly through the city.
Schaffer and Brown were sent a special signal.