The big mistake that the man makes is that He builds his fire under a spruce tree.
Explanation:
In “To Build a Fire” by Jack London. the character of the man, directs himself to a fatal ending because he didn't listen to the warnings of his surroundings, then near to his inevitable death he tries to save himself by building a fire but he does it under a spruce and all the snow that was above it falls down on his fire extinguishing it and making him frozen to dead.
The structure of the article makes the author's argument more effective because the author shares factors that drive people from behaving correctly to behave incorrectly