Read this excerpt from Susan Butcher and the Iditarod Trail. Meanwhile “Wild Bill” faced a number of problems. The temperature had dropped to fifty degrees below zero. Speed was important, but he could not push his team too hard. The dogs' lungs might frost from breathing heavily in the Arctic air. To protect his own lungs, Bill breathed only through his nose. The bitter wind howled and hurled snow in his face. The trail was a blur.

What is the best inference a reader could make from this excerpt?

The only choice Bill had was to move as quickly as possible.
Bill did not understand how to handle the cold Arctic weather.
Moving too quickly could cause Bill and his dogs to become ill or die.
Bill could not see the trail because of how quickly his team was moving.