During the Middle Ages, Victims of the Imaginary Illness "Dancing

During the Middle Ages, victims of the imaginary illness "dancing manias" lost all inhibitions and whirled wildly through the streets. During the twentieth century, modern Americans fell prey to the misdeeds of a "phantom anesthetist" who entered homes and gassed the inhabitants. According to your text, how is mass psychogenic illness most different today from how it was in the Middle Ages?

A) In the past, symptoms were religious in nature; today they are technological.
B) In the past, normative social influence contributed to contagion; today, informational social influences contribute.
C) Today there is greater consensus than in the past about the so-called "sources" of such illnesses.
D) Today, the modern mass media accelerate the rate of "infection."