The best choice that captures the symbolism of the red room in "The Masque of the Red Death" is:
D. The red room symbolizes blood and the inevitability of death. Its deep red color represents the presence of the Red Death, reminding the characters that death is inescapable, even behind closed doors. This contributes to the story's theme by showing that wealth and isolation cannot shield people from mortality.
This option effectively highlights the connection between the red room and the overarching theme of mortality in the story, emphasizing that no matter how much one tries to avoid or escape death through wealth and isolation, it remains an inescapable reality.