Respuesta :
The answer to the question is the letter "C" or the third item in the choices.
When Ushers decides to preserve his sister's body for two weeks in the vault in the house, the narrator's idea is that "He knows that Usher will go insane if Madeline's body leaves the house".
When Ushers decides to preserve his sister's body for two weeks in the vault in the house, the narrator's idea is that "He knows that Usher will go insane if Madeline's body leaves the house".
I believe the answer is c) he knows that User will go insane if Madeline's body leaves the house.