Answer: B. There were not enough firefighters to do all of the necessary tasks.
Step-by-step explanation: In the excerpt from The Great Fire, firefighters asked spectators to help because there were not enough firefighters to do all of the necessary tasks. The passage mentions that Chief Marshal Williams had managed to get a thin circle of engines around the fire, but they needed more people to control the engines and steamers.
By asking the spectators for help, the firefighters hoped to have additional hands to operate the five steamers, three hose carts, and the hook-and-ladder wagon. This would allow them to pump water into the fire at different locations and better contain and extinguish the flames.