Read the passage from “The Fall of the House of Usher” by Edgar Allan Poe. From “The Fall of the House of Usher” by Edgar Allan Poe

Shaking off from my spirit what must have been a dream, I scanned more narrowly the real aspect of the building. Its principal feature seemed to be that of an excessive antiquity [old age or looking like an antique]. The discoloration of ages had been great. Minute fungi overspread the whole exterior . . . No portion of the masonry [stonework] had fallen; and there appeared to be a wild inconsistency between its still perfect adaptation of parts, and the crumbling condition of the individual stones.
Poe is using two types of organization in this passage: spatial and order of importance. Focusing on order of importance, which phrase represents the most significant detail in this description?

seemed to be that of an excessive antiquity

A. No portion of the masonry [stonework] had fallen

B. Minute fungi overspread the whole exterior

C. the crumbling condition of the individual stones