Read this excerpt from The Call of the Wild by Jack London. The next he knew, he was dimly aware that his tongue was hurting and that he was being jolted along in some kind of a conveyance. The hoarse shriek of a locomotive whistling a crossing told him where he was. He had travelled too often with the Judge not to know the sensation of riding in a baggage car.
What does the excerpt reveal about the historical context of the story?
A. Cars were more popular than trains.
B. Traveling by train was common.
C. Judicial districts covered large areas.
D. There were laws preventing animal cruelty.