Allison thought back to the carefree days before her family headed west. She could swim in the creek or play with her dolls. Things were different now that they were on the wagon trail. She had to help with the little ones while Ma set up the kitchen and cooked the meals. Allison even helped Pa with the horses. Most days, Allison was too busy to even miss the creek or her dolls. Her family needed her, and she was glad to be able to help. Which statement best explains how the setting affects the plot of this story? A. The setting is the social environment of pioneers, which leads Allison's parents to wish that they had not chosen a life of such difficulty for their children. B. The setting is a wagon trail, which enables the author to share the message that our present-day society should learn to be as tough as the pioneers. C. The setting is a wagon trail, which means that Allison's family members must do whatever they can to survive the hardships of the journey. D. The setting is the social environment of pioneers, which causes Allison to feel pressure to be as strong as the other children.