Poe believed that a good short story should achieve "unity of effect," meaning that all details, from plot to characters to setting, should all build towards a single mood, emotion, or effect. what is the defining mood of "masque of the red death"? give 1 example (such as character description, plot details, or setting descriptions) that convey the mood.

Explanation:

Edgar Allan Poe used allegory (mood) about death (Red Death = plague), instead of identifying  the true nature of  disease/plague.

"Prince Prospero  hosts a masquerade ball , each decorated with a different color. In the midst of their revelry, a mysterious figure disguised as a Red Death victim enters "

the answer is d: message a character's thoughts