Read this excerpt from Susan Butcher and the Iditarod Trail. On January 29, Edgar Nollner waited in a dark cabin at Whiskey Creek, close to the halfway point. Suddenly he sat up. Bells! Was he hearing things? He ran to the window and found that it was Bill McCarty, who had tied sleigh bells to his dogs, coming in from the Ruby relay cabin. Mushers, either by choice or in some towns by law, often tied bells on their lead dogs to warn people they were coming up behind them. Edgar had not expected to hear Bill's bells for several days, but he wasted no time. He took the serum and started north along the frozen Yukon River. What is the best inference based on the information in the excerpt? Bill McCarty was able to travel with great speed. Edgar Nollner did not use sleigh bells on his dogs. Bill McCarty was supposed to go to the halfway point. Edgar Nollner and his dogs were not prepared to leav