Final answer:
The lesson from the man using the blanket to resemble a pig's back to save himself is to always be careful. This echoes the underlying message in various literary excerpts about caution and awareness being crucial for survival.
Step-by-step explanation:
The man saves himself by using his ingenuity and a blanket to mimic an animal—a pig, specifically. The arose from literature showing characters' struggle against nature and their environment. The correct interpretation of the lesson in this context is B) The lesson is to always be careful. This is exemplified through the various excerpts presented, where each character's survival depends on their caution and awareness of their surroundings, whether it's being mindful of dangers such as frost, using wisdom shared by more experienced individuals, or understanding the implications of their actions on their environment and the creatures within it.