The symbol in “The Masque of the Red Death” that is used by the author to indicate the deadly disease is: "the uninvited guest" (Option B)
A Symbol in literature is the act of referring to a person or an event or thing using another thing or word.
The metaphor of the uninvited guest is easy to understand because no one want to be plagued by a deadly disease. Hence, the reason why B is the correct option.
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