Answer:
d. the crack indicates the house is vulnerable to collapse.
Step-by-step explanation:
The House of Usher was claimed by Usher individuals for ages and "the disintegrating state of the individual stones" speaks to every relative and foretells that the house will crumple. Toward the finish of the story, a tempest wins and Roderick turns out to be anxious, again portending that the house would soon collapse.