Answer:
Option C. The main idea of paragraph 26 is to not tamper with fate or you will regret it.
Step-by-step explanation:
The main concept of paragraph 26 from "The Monkey's Paw" is the implication that the paw is evil and therefore that any wish made from it will encounter bad consequences. The Sergeant-Major tells the story of how the paw became magical as a warning to be careful with it. It uses the paw to caution people against trying to temper with their own fates, as those who had interfered with it were always followed by sorrow.