Part a: which of the following statements best describes a central idea of the text?

a
in the early 1500s, a strange illness caused many townspeople to experience muscle spasms that made them look like they were dancing.
b
in the early 1500s, a group of townspeople began dancing for no apparent reason and, even more troubling, they could not stop.
c
only until very recently, the dancing plague of 1518 was considered a myth, one with very little evidence to support its existence.
d
in medieval france, it was customary for dancing festivals to last days, even weeks, often leading to exhaustion and occasionally death.