A. To Build a Fire" is set in the wilderness in extreme temperatures, while "Gumption" is set inside a house in a town in winter.
Explanation:
This is the main difference between these two stories. In the first story, we learn about a man who is in the wilderness. He tells us that the temperature is at fifty below, or even lower. This suggests that the man is extremely cold, and perhaps in danger. On the other hand, the second excerpt describes the life of a family during the Great Depression. The events described are set inside a house in a town in winter.