Answer:
You didn't post the answers to choose from, so here is what I know of the Dancing Plague...
Explanation:
Vitus superstition may have triggered a stress-induced hysteria that took hold of much of the city. Other theories have suggested the dancers were members of a religious cult, or even that they accidentally ingested ergot, a toxic mold that grows on damp rye and produces spasms and hallucinations.
